Question

f (x) = x 2 + 3x - 7 I need help

Answer 1

Best Answer - Chosen by Voters
1. Assume that f(x) = (x/2) - 3x - 7

Substitute x with 5 to get:

f(5) = 5/2 - 3(5) - 7
= 2.5 - 15 - 7
= 2.5 - 22
= -19.5

2. Do the same for this problem!

f(5) = (5)² - 3(5) - 7
= 25 - 15 - 7
= 10 - 7
= 3

Answer 2

do you know formula for discriminat because this is a quadratic equation what i think that you need to solve it

yes ?