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Simplification of an Expression

If fx = -x3...

Question

If $f (x) = - x^{3} + 3 x^{2} - 2 x + 4$ . Find $f (3)$ .

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Solution

Given, $f (x) = - x^{3} + 3 x^{2} - 2 x + 4.$

Then, $f (3) = - (3)^{3} + 3 (3)^{2} - 2 (3) + 4$

$= - 27 + 27 - 6 + 4 = - 2$ .

Hence, the required value of $f (3) = - 2$ .

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Simplification of an Expression

Standard VIII Mathematics

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