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harkovskaia [24]
2 years ago
15

Please help:)) will give brainliest:)

Mathematics
1 answer:
ValentinkaMS [17]2 years ago
8 0

Answer:

rhombus, rectangle, trapezoid

Step-by-step explanation:

can i get the crown pls pls pls?

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Question 4(Multiple Choice Worth 1 points) (07.04 LC) Factor completely 49x2 − 9. (7x + 3)(7x − 3) (7x + 3)(x − 3) (7x − 3)(7x −
scoundrel [369]

Answer:

A

Step-by-step explanation:

We take a look at this expression: 49x^2-9 and notice that both terms are square numbers. 49x^2=(7x)^2 and 9=3^2.

There is a specific formula that I highly recommend you memorize involving differences of squares. It states that given the difference of squares a^2-b^2, it can always be factored into (a+b)(a-b).

Here, we can apply that. In this case, a = 7x and b = 3. So:

49x^2-9=(7x)^2-3^2=(7x+3)(7x-3)

Thus, the answer is A.

Hope this helps!

6 0
3 years ago
Read 2 more answers
What is the product of 4xy and y^2+2x
kondaur [170]

<em>Look</em><em> </em><em>at</em><em> </em><em>the</em><em> </em><em>attached</em><em> </em><em>picture</em>

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3 0
2 years ago
Help with my algebra homework.
just olya [345]
Q1. The answer is \frac{(x-4)(x-4)}{(x+3)(x+1)}= \frac{ x^{2}-4x-4x+16}{ x^{2} +x+3x+3} = \frac{ x^{2} -8x+16}{ x^{2} +4x+3}
\frac{ x^{2} -16}{ x^{2} +5x+6} / \frac{ x^{2} +5x+4}{ x^{2} -2x-8} = \frac{ x^{2} -16}{ x^{2} +5x+6}* \frac{x^{2} -2x-8}{ x^{2} +5x+4}
Now, factorise the numerators and denominators:
x² - 16 = x² - 4² = (x + 4)(x - 4)
x² + 5x + 6 = x² + 2x + 3x + 2*3 = x(x+2) + 3(x+2) = (x + 2)(x + 3)
x² - 2x - 8 = x² + 2x - 4x - 2*4 = x(x+2) - 4(x+2) = (x + 2)(x - 4)
x² + 5x + 4 = x² + x + 4x + 4*1 = x(x+1) + 4(x+1) = (x + 1)(x + 4)

\frac{ x^{2} -16}{ x^{2} +5x+6}* \frac{x^{2} -2x-8}{ x^{2} +5x+4}= \frac{(x+4)(x-4)}{(x+2)(x+3)} * \frac{(x+2)(x-4)}{(x+1)(x+4)}
Now, cancel out some factors:
\frac{(x+4)(x-4)}{(x+2)(x+3)} * \frac{(x+2)(x-4)}{(x+1)(x+4)}= \frac{(x-4)(x-4)}{(x+3)(x+1)}=  \frac{ x^{2}-4x-4x+16}{ x^{2} +x+3x+3} = \frac{ x^{2} -8x+16}{ x^{2} +4x+3}


Q2. The answer is \frac{7(a-7)}{(a-8)(a+8)}
Since a² - b² = (a-b)(a+b), then a²- 64 = a² - 8² = (a-8)(a+8).
\frac{7}{a+8} +  \frac{7}{ a^{2} -64} = \frac{7}{a+8} +  \frac{7}{ (a+8)(a-8)}= \frac{7(a-8)}{(a+8)(a-8)} +  \frac{7}{ (a+8)(a-8)}= \frac{7(a-8)+7}{ (a+8)(a-8)}
= \frac{7(a-8)+7*1}{(a+8)(a-8)} =\frac{7(a-8+1)}{(a+8)(a-8)} =\frac{7(a-7)}{(a+8)(a-8)}


Q3. The answer is \frac{7(3a-4)}{(a-6)(a+8)}
\frac{ a^{2} -2a-3}{ a^{2}-9a+18 }-  \frac{a^{2} -5a-6}{ a^{2}+9a+8 }  = \frac{a^{2}+a-3a-3*1}{a^{2}-3a-6a+3*6} - \frac{a^{2}-a-6a-6*1}{a^{2}+a+8a+8*1}
= \frac{a(a+1)-3(a+1)}{a(a-3)-6(a-3)}- \frac{a(a+1)-6(a+1)}{a(a+1)+8(a+1)}= \frac{(a+1)(a-3)}{(a-6)(a-3)} - \frac{(a+1)(a-6)}{(a+1)(a+8)}
Now, cancel out some factors:
\frac{(a+1)(a-3)}{(a-6)(a-3)} - \frac{(a+1)(a-6)}{(a+1)(a+8)}= \frac{a+1}{a-6} - \frac{a-6}{a+8}
\frac{a+1}{a-6} - \frac{a-6}{a+8}= \frac{(a+1)(a+8)}{(a-6)(a+8)} -\frac{(a-6)(a-6)}{(a-6)(a+8)} =\frac{(a+1)(a+8)-(a-6)(a-6)}{(a-6)(a+8)}
= \frac{ a^{2} +9a+8- a^{2} +12-36}{(a-6)(a+8)} =\frac{9a+8+12-36}{(a-6)(a+8)} =\frac{21a-28}{(a-6)(a+8)} =\frac{7(3a-4)}{(a-6)(a+8)}


Q4. The answer is \frac{4x}{(x+3)(1+3x)}=\frac{4x}{ x^{2} +10x+3}
\frac{4}{x+3} / (\frac{1}{x}+3 )=\frac{4}{x+3} / (\frac{1}{x}+ \frac{3x}{x})=\frac{4}{x+3} / (\frac{1+3x}{x})= \frac{4}{x+3} * \frac{x}{1+3x} = \frac{4x}{(x+3)(1+3x)}
\frac{4x}{(x+3)(1+3x)}= \frac{4x}{x+3 x^{2} +3+9x}= \frac{4x}{ x^{2} +10x+3}


Q5. The answer is x = 6
\frac{-2}{x} +4= \frac{4}{x} +3
4-3= \frac{4}{x}- \frac{-2}{x}
1 = \frac{4-(-2)}{x}
1= \frac{4+2}{x}
1= \frac{6}{x}
x = 6
Let's check the solution:
Since: \frac{-2}{x} +4= \frac{4}{x} +3
Then: \frac{-2}{6}+4 = \frac{4}{6} +3
           - \frac{1}{3}+ \frac{4*3}{3}= \frac{2}{3} + \frac{3*3}{3}
           - \frac{1}{3} + \frac{12}{3} =  \frac{2}{3} + \frac{9}{3}
           \frac{-1+12}{3} = \frac{2+9}{3}
           \frac{11}{3} = \frac{11}{3}
Thus, the solution is correct
6 0
3 years ago
Can someone help me with this question? will give thanks!
marin [14]

Answer:

B. 63

Step-by-step explanation:

There are two similar triangles given in the diagram above. Since they area similar, they also have corresponding side lengths that are proportional.

Therefore:

(6 + 3)/3 = x/21

9/3 = x/21

3 = x/21

Cross multiply

21*3 = x

63 = x

x = 63

3 0
3 years ago
To find the depth of a pond, a scientist puts a 100-inch pole vertically into the
marusya05 [52]

Answer:

The pond is 82 inches deep.

Step-by-step explanation:

100 in - 18 in = 82 in

Hope this helps and please mark brainliest!

3 0
3 years ago
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