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find f(-3) given F(x)=3x^2+x-7

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1 Answer

f(x) = 3x2 + x - 7
 
The notation f(-3) means f(x=-3).  So all you have to do is set the x equal to -3 in the equation and compute the answer:
 
f(-3) = 3(-3)2 + (-3) - 7
 
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f(-3) = 3(9) - 3 - 7 = 27 - 10 = 17

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Philip already provided the correct answer, which is 17.

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