1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lelu [443]
2 years ago
10

Can someone please help me with these 7 questions please?

Mathematics
1 answer:
yarga [219]2 years ago
3 0

(1)\ (-xy)^3(xz)

Expand

(-xy)^3(xz) = (-x)^3* y^3*(xz)

(-xy)^3(xz) = -x^3* y^3*xz

Rewrite as:

(-xy)^3(xz) = -x^3*x* y^3*z

Apply law of indices

(-xy)^3(xz) = -x^4y^3z

(2)\ (\frac{1}{3}mn^{-4})^2

Expand

(\frac{1}{3}mn^{-4})^2 =(\frac{1}{3})^2m^2n^{-4*2}

(\frac{1}{3}mn^{-4})^2 =\frac{1}{9}m^2n^{-8

(3)\ (\frac{1}{5x^4})^{-2}

Apply negative power rule of indices

(\frac{1}{5x^4})^{-2}= (5x^4)^2

Expand

(\frac{1}{5x^4})^{-2}= 5^2x^{4*2}

(\frac{1}{5x^4})^{-2}= 25x^{8

(4)\ -x(2x^2 - 4x) - 6x^2

Expand

-x(2x^2 - 4x) - 6x^2 = -2x^3 + 4x^2 - 6x^2

Evaluate like terms

-x(2x^2 - 4x) - 6x^2 = -2x^3 -2x^2

Factor out x^2

-x(2x^2 - 4x) - 6x^2 = (-2x-2)x^2

Factor out -2

-x(2x^2 - 4x) - 6x^2 = -2(x+1)x^2

(5)\ \sqrt{\frac{4y}{3y^2}}

Divide by y

\sqrt{\frac{4y}{3y^2}} = \sqrt{\frac{4}{3y}}

Split

\sqrt{\frac{4y}{3y^2}} = \frac{\sqrt{4}}{\sqrt{3y}}

\sqrt{\frac{4y}{3y^2}} = \frac{2}{\sqrt{3y}}

Rationalize

\sqrt{\frac{4y}{3y^2}} = \frac{2}{\sqrt{3y}} * \frac{\sqrt{3y}}{\sqrt{3y}}

\sqrt{\frac{4y}{3y^2}} = \frac{2\sqrt{3y}}{3y}

(6)\ \frac{8}{3 + \sqrt 3}

Rationalize

\frac{8}{3 + \sqrt 3} = \frac{3 - \sqrt 3}{3 - \sqrt 3}

\frac{8}{3 + \sqrt 3} = \frac{8(3 - \sqrt 3)}{(3 + \sqrt 3)(3 - \sqrt 3)}

Apply different of two squares to the denominator

\frac{8}{3 + \sqrt 3} = \frac{8(3 - \sqrt 3)}{3^2 - (\sqrt 3)^2}

\frac{8}{3 + \sqrt 3} = \frac{8(3 - \sqrt 3)}{9 - 3}

\frac{8}{3 + \sqrt 3} = \frac{8(3 - \sqrt 3)}{6}

Simplify

\frac{8}{3 + \sqrt 3} = \frac{4(3 - \sqrt 3)}{3}

(7)\ \sqrt{40} - \sqrt{10} + \sqrt{90}

Expand

\sqrt{40} - \sqrt{10} + \sqrt{90} =\sqrt{4*10} - \sqrt{10} + \sqrt{9*10}

Split

\sqrt{40} - \sqrt{10} + \sqrt{90} =\sqrt{4}*\sqrt{10} - \sqrt{10} + \sqrt{9}*\sqrt{10}

Evaluate all roots

\sqrt{40} - \sqrt{10} + \sqrt{90} =2*\sqrt{10} - \sqrt{10} + 3*\sqrt{10}

\sqrt{40} - \sqrt{10} + \sqrt{90} =2\sqrt{10} - \sqrt{10} + 3\sqrt{10}

\sqrt{40} - \sqrt{10} + \sqrt{90} =4\sqrt{10}

(8)\ \frac{r^2 + r - 6}{r^2 + 4r -12}

Expand

\frac{r^2 + r - 6}{r^2 + 4r -12}=\frac{r^2 + 3r-2r - 6}{r^2 + 6r-2r -12}

Factorize each

\frac{r^2 + r - 6}{r^2 + 4r -12}=\frac{r(r + 3)-2(r + 3)}{r(r + 6)-2(r +6)}

Factor out (r+3) in the numerator and (r + 6) in the denominator

\frac{r^2 + r - 6}{r^2 + 4r -12}=\frac{(r -2)(r + 3)}{(r - 2)(r +6)}

Cancel out r - 2

\frac{r^2 + r - 6}{r^2 + 4r -12}=\frac{r + 3}{r +6}

(9)\ \frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14}

Cancel out x

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4x + 8}{x} \cdot \frac{1}{x^2 - 5x - 14}

Expand the numerator of the 2nd fraction

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4x + 8}{x} \cdot \frac{1}{x^2 - 7x+2x - 14}

Factorize

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4x + 8}{x} \cdot \frac{1}{x(x - 7)+2(x - 7)}

Factor out x - 7

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4x + 8}{x} \cdot \frac{1}{(x + 2)(x - 7)}

Factor out 4 from 4x + 8

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4(x + 2)}{x} \cdot \frac{1}{(x + 2)(x - 7)}

Cancel out x + 2

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4}{x} \cdot \frac{1}{(x - 7)}

\frac{4x + 8}{x^2} \cdot \frac{x}{x^2 - 5x - 14} = \frac{4}{x(x - 7)}

(10)\ (3x^3 + 15x^2 -21x) \div 3x

Factorize

(3x^3 + 15x^2 -21x) \div 3x = 3x(x^2 + 5x -7) \div 3x

Cancel out 3x

(3x^3 + 15x^2 -21x) \div 3x = x^2 + 5x -7

(11)\ \frac{m}{6m + 6} - \frac{1}{m+1}

Take LCM

\frac{m}{6m + 6} - \frac{1}{m+1} = \frac{m(m + 1) - 1(6m + 6)}{(6m + 6)(m + 1)}

Expand

\frac{m}{6m + 6} - \frac{1}{m+1} = \frac{m^2 + m- 6m - 6}{(6m + 6)(m + 1)}

\frac{m}{6m + 6} - \frac{1}{m+1} = \frac{m^2 - 5m - 6}{(6m + 6)(m + 1)}

(12)\ \frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}}

Rewrite as:

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{1}{y - 3} \div \frac{2}{y^2 - 9}

Express as multiplication

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{1}{y - 3} * \frac{y^2 - 9}{2}

Express y^2 - 9 as y^2 - 3^2

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{1}{y - 3} * \frac{y^2 - 3^2}{2}

Express as difference of two squares

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{1}{y - 3} * \frac{(y - 3)(y+3)}{2}

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{1}{1} * \frac{(y+3)}{2}

\frac{\frac{1}{y - 3}}{\frac{2}{y^2 - 9}} = \frac{y+3}{2}

Read more at:

brainly.com/question/4372544

You might be interested in
Solve the following equation for all values of x <br> 2x^2+18x-17=11x-2
Cerrena [4.2K]

2x^2 + 18x - 17 = 11x - 2

           -11x   +2    -11x   +2

2x^2 +7x - 15 = 0

(x - 1.5) (x + 5)

x = 1.5    x = -5

3 0
3 years ago
How long will it take 5 machines to complete a task, given that it takes 10 days for 8 machines to complete the same task?
Tamiku [17]

Answer:

Step-by-step explanation:

4 days

8/10 * 5 = 4

4 0
3 years ago
Can someone help me with this question please
Whitepunk [10]
You know how there are 4 different areas in the graph, rotating it 180 degrees from that position will make it be in quadrant 2 (top left). in order to graph the ponts, since it is right across, then you just have to flip the shape around. like how you take a selfe, it flips the capture image around
3 0
3 years ago
What is the distance between -10 and six on a number line
Mkey [24]

Answer:

10+6=16

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
HELP ILL GIVE BRAINLIEST
Alex17521 [72]
Y=2x+2 easy
The slop=2/1
Y-int= (0,2)
7 0
2 years ago
Other questions:
  • F(x) = x(2x/2)/x(x+5)(x+6)^2 <br><br> Find the vertical asymptotes?
    10·1 answer
  • The time to complete a project is inversely proportional to number of people who are doing the project. A certain project can be
    15·1 answer
  • Help me with this and show work!!
    14·1 answer
  • Multiply: 10x(x – 17)
    10·2 answers
  • What is the slope of the line that contains the points (3, 4) and (1, 2)? A. 1 B. –1 C. D.
    10·1 answer
  • Eva gathered samples for the average monthly temperatures of two cities and calculated the five number summaries. What conclusio
    9·1 answer
  • What is the partial product for 43x17
    15·1 answer
  • Triangles-- find the M&lt;ECD if ​ABC angels are 31 degress.<br>picture added​
    9·1 answer
  • Nicholas is buying shirts for his baseball team. He will pay $9.50 for each shirt plus a one-time fee of $22.50 for the design.
    7·1 answer
  • What is 3/4 + 1/3? answer please
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!