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If f(x)=x^4+3x^3-x^2+6, find f(-3).

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Answer:

f(-3) = -3

Explanation:

Step 1: f(x) means "f of x" and f(-3) means "f of -3", so you have to replace all the "x" letters in the function with the value -3.


f(x)=x^4+3x^3-x^2+6\\f(-3)=(-3)^4+3(-3)^3-(-3)^2+6

Step 2: Apply the exponents. Make sure you remember to put in the -3 and not just 3.


f(-3)=81+3(-27)-9+6

Step 3: Use BEDMAS rules to complete the calculation.


f(-3)=81-81-9+6


f(-3)=-3

Therefore the answer is f(-3) = -3.

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