Question

F(x) = -x² + x + 13
Find f(9)

Answer 1

103.

Explanation:

If you plug in 9 for the value of x in the equation, 103 is your answer.

Answer 2

f(9) = -59

Explanation:

to find f(9), just substitue 9 for every x value in the equation

for example:

f(x) = -x² + x + 13

substitute in 9 for the x values

f(9) = -9² + 9 + 13

solve and add like terms

f(9) = -59