If $f (x) = 3 x^{2} - x$ $f(x) = 3x^2-x$ , what is $f (- 5)$ $f(-5)$ ?

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If $f (x) = 3 x^{2} - x$ $f(x) = 3x^2-x$ , what is $f (- 5)$ $f(-5)$ ?

2 Answers

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Answer 1 · 2018-07-04T01:48:16

$80$ $80$

Explanation:

$f (- 5)$ $f(-5)$ means that $x = - 5$ $x=-5$ . With this in mind, we can plug this into $f (x)$ $f(x)$ . We will get

$f (- 5) = 3 {(- 5)}^{2} - (- 5)$ $f(-5)=3(-5)^2-(-5)$

This simplifies to

$3 (25) + 5 = 80$ $3(25)+5=80$

Hope this helps!

Answer 2 · 2018-07-04T08:36:48

$80$ $80$

Explanation:

$substitute x = - 5 into f (x)$ $"substitute " x = -5 " into "f(x)$

$f (- 5) = 3 {(- 5)}^{2} - (- 5)$ $f(color(red)(-5))=3(color(red)(-5))^2-(color(red)(-5))$

$\times \times = (3 \times 25) + 5$ $color(white)(xxxx)=(3xx25)+5$

$\times \times = 75 + 5 = 80$ $color(white)(xxxx)=75+5=80$

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If $f (x) = 3 x^{2} - x$ $f(x) = 3x^2-x$ , what is $f (- 5)$ $f(-5)$ ?

2 Answers

Explanation:

Explanation:

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