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
velikii [3]
3 years ago
14

Expand (3x+7)(3x-7) =

Mathematics
2 answers:
saveliy_v [14]3 years ago
8 0

Answer:

9 {x}^{2}  - 49

Step-by-step explanation:

Do FOIL, first outside inside last

3x × 3x = 9x^2

3x × -7 = -21x

7 × 3x = 21x

7 × -7 = -49

9 {x}^{2}   - 21x + 21x - 49 \: midde \: cancels \: each \: other \: out

So it would just be 9x^2 - 49

Tamiku [17]3 years ago
8 0

(3x + 7)(3x - 7) =

= 9x² + 21x - 21x - 49

= 9x² - 49

You might be interested in
Uses both multiplication and addition to find the result
krok68 [10]

Answer:

Where's the question or picture?


Step-by-step explanation:


8 0
3 years ago
Determine whether the following equation defines y as a function of x.
Aleks04 [339]

Answer:

The equation can define y as a function of x and it also can define x as a function of y.

Step-by-step explanation:

A relation is a function if and only if each value in the domain is mapped into only one value in the range.

So, if we have:

f(x₀) = A

and, for the same input x₀:

f(x₀) = B

Then this is not a function, because it is mapping the element x₀ into two different outputs.

Now we want to see it:

x + y = 27

defines y as a function of x.

if we isolate y, we get:

y = f(x) = 27 - x

Now, this is a linear equation, so for each value of x we will find an unique correspondent value of y, so yes, this is a function.

Now we also want to check if:

x +  y = 27

defines x as a function of y.

So now we need to isolate x to get:

x = f(y) = 27 - y

Again, this is a linear equation, there are no values of y such that f(y) has two different values. Then this is a function.

3 0
3 years ago
Definition of inequality
Rus_ich [418]
DescriptionIn mathematics, an inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions. It is used most often to compare two numbers on the number line by their size.
6 0
3 years ago
Read 2 more answers
Which of the following is equal to the absolute value of 7 A.-3and-4 on a number line. B.7and0 on a number line. C.1and7 on a nu
lozanna [386]
Absolute Value can’t be negative so -3 minus -4 is -7 but since absolute value isn’t able to be negative it turns into 7, the answer is A
5 0
2 years ago
Read 2 more answers
4. Lisa walked 48 blocks in 3 hours.<br> blocks per hour
dlinn [17]

Answer:

The number of blocks in one hour is the same that the unit rate, so 16 blocks per hour

Step-by-step explanation:

we know that

To find out the unit rate, divide the total blocks by the total time

so

\frac{48}{3}\ \frac{blocks}{hours}=16\ \frac{blocks}{hour}

3 0
2 years ago
Other questions:
  • Which triangle is a 30°-60°-90° triangle?<br>A. B. C. or D.
    5·2 answers
  • Martina is currently 16 years older than her cousin Joey. In 5 years she will be 3 times as old as Joey. Use this information to
    13·2 answers
  • Circle O has a radius of 5 centimeters and central angle AOB with a measure of 60°. Describe in complete sentences how to find t
    10·1 answer
  • It is a four digit whole number
    11·1 answer
  • The questions are on the pictures ( I’m sorry there are so much pictures I couldn’t make the page smaller) :(
    9·2 answers
  • Am I right ? And if I'm not can you help please?
    13·1 answer
  • Write in point-slope form an equation of the line that passes through the point (3,0) with slope 23.
    15·1 answer
  • Combine like terms to complete the equivalent expression. 2 1/2 z² + 4 1/2 + 7z - 4 +5z - 1/2 z² = ( _ z² - _z²) + ( 7z + _ z) +
    14·1 answer
  • Helllllllllppppppppppppppppppppppppp
    15·2 answers
  • B. Solve for the product of the following fractions. Express your answer in simples form.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!