How do you find the answer for f (5) when f (x) = - 3x^4+7x^2-2

Question

Mathematics

Weiss

22 June, 08:31

How do you find the answer for f (5) when f (x) = - 3x^4+7x^2-2

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Skyler · Answer 1

You find f (5) the same way you evaluate any function. Put the number where the variable is and do the arithmetic.

When high powers are involved, it can simplify the arithmetic a little to do some factoring:

... f (x) = (-3x^2 + 7) * x^2 - 2

... f (5) = (-3*25 + 7) * 25 - 2 = - 68*25 - 2

... f (5) = - 1702