3 years ago

Simplify: 4y - 8y2 + 9y - 7y2.

2 answers:

8 0

Hello!

You can only combine terms that have the same variables and exponents

4y + 9y = 13y
-8y^2 - 7y^2 = -15y^2

The answer is 13y - 15y^2

Hope this helps!

Zanzabum3 years ago

5 0

The answer is 13y-15y^2

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2 years ago

Find the average rate of change of f(x) = 4x² – 3 from 3 to 9.

Lina20 [59]

Answer:

Step-by-step explanation:

Given:

$f(x) = 4x^2 - 3$

Required:

Average range of change from 3 to 9

SOLUTION:

Step 1:

Find f(3) and f(9):

To find f(3), replace x with 3 in the given function

$f(3) = 4(3)^2 - 3$

$f(3) = 4(9) - 3$

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$f(3) = 33$

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$f(9) = 4(9)^2 - 3$

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Plug in the values into the formula for average rate of change.

$= \frac{321 - 33}{9 - 3}$

$= \frac{288}{6}$

$= 44$

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