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Veronika [31]
3 years ago
7

Number 21 please help! Thank you!

Mathematics
1 answer:
Nina [5.8K]3 years ago
4 0
7 x 3 = 21
7 + 7 +7 = 21
3 ÷ 7 = 21
21 - 7 = 3
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If f (x) = x² - 7, evaluate the following: f(12) f(-7)
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Answer: f(12) = 137, f(-7) = 42

Step-by-step explanation: In a function, what you want to do is plug in the value they give you for x. This means you substitute x with the value they are looking for.

In this case, they are looking at 12 and -7. Let's do 12 first.

The equation becomes (12^2) - 7. 12^2 is 144, and 144-7 is 137.

Now we do -7. The equation becomes (-7)^2 - 7. -7^2 is 49, and 49 - 7 is 42.

Hope this helped!

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