How do you find $f (2)$ $f(2)$ given $f (x) = 9 x^{3} - x^{2} + 2$ $f(x)=9x^3-x^2+2$ ?

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How do you find $f (2)$ $f(2)$ given $f (x) = 9 x^{3} - x^{2} + 2$ $f(x)=9x^3-x^2+2$ ?

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Answer 1 · 2016-08-05T19:06:41

f(2) = 70

Explanation:

To evaluate f(2) $substitute x = 2 in f(x)$ $color(blue)"substitute x = 2 in f(x)"$

$\Rightarrow f (2) = 9 {(2)}^{3} - {(2)}^{2} + 2$ $rArrf(color(red)(2))=9(color(red)(2))^3-(color(red)(2))^2+2$

$= (9 \times 8) - (2 \times 2) + 2 = 72 - 4 + 2 = 70$ $=(9xx8)-(2xx2)+2=72-4+2=70$

$\Rightarrow f (2) = 70$ $rArrf(2)=70$

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How do you find $f (2)$ $f(2)$ given $f (x) = 9 x^{3} - x^{2} + 2$ $f(x)=9x^3-x^2+2$ ?

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Explanation:

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How do you find $f (2)$ $f(2)$ given $f (x) = 9 x^{3} - x^{2} + 2$ $f(x)=9x^3-x^2+2$ ?