Please could you solve this equation?

2008-04-02 4:15 pm

If f(x)= 5-3x-x^2 , find f(-3)

I got an answer of -4, am I correct?

回答 (8)

2008-04-05 4:46 pm

✔ 最佳答案

f (- 3) = 5 + 9 - 9
f (- 3) = 5

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2008-04-02 4:20 pm

F(-3) = 5 - 3(-3) - (-3)^2
=5 + 9 - 9
=5

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2008-04-02 4:20 pm

f(-3) = 5 - 3(-3) - (-3)^2
= 5 - (-9) - 9
= 5 + 9 - 9
= 5

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2008-04-02 4:19 pm

Not quite..

f(x)= 5-3x-x^2 , find f(-3)

Simply plug -3 in for x:

5 - 3(-3)-(-3)^2 =

5 + 9 - 9 =

5

**Be careful with your signs...

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2008-04-02 4:19 pm

f(-3)=5+9-9=5
its 5......

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2008-04-02 4:19 pm

No, the answer is 5. Check your calculation, it's not hard.

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2008-04-02 4:19 pm

I make it 5

5+9-9=5

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2008-04-02 4:18 pm

i get 5
5-(3*-3)-(-3*-3)
5+9-9
5

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