Question

find the indicated value of each function f(x)=-8x+14+15x^2 find f(-3)

Answer 1

$\qquad\qquad\huge\underline{{\sf Answer}}$

Let's evaluate ~

$\qquad \sf  \dashrightarrow \:f(x) =- 8x + 14 + 15 {x}^{2}$

we have to find value of f(-3), so plug the value of x as -3 in the equation ~

$\qquad \sf  \dashrightarrow \:f( - 3) =- 8( - 3) + 14 + 15 {( - 3)}^{2}$

$\qquad \sf  \dashrightarrow \:f( - 3) = 24 + 14 + 15 {(9)}^{}$

$\qquad \sf  \dashrightarrow \:f( - 3) = 38+ 135$

$\qquad \sf  \dashrightarrow \:f( - 3) = 173$

I hope it's easy to understand now ~

Answer 2

f(-3):

$\\ \rm\Rrightarrow 15x²-8x+14$

$\\ \rm\Rrightarrow 15(-3)²-8(-3)+14$

$\\ \rm\Rrightarrow 15(9)+24+14$

$\\ \rm\Rrightarrow 135+38$

$\\ \rm\Rrightarrow 173$