Use the quadratic formula
9x^2+3x-1=0

9x2+3x−1=0

Step 1: Use quadratic formula with a=9, b=3, c=-1.

x= −b±√b2−4ac

2a

x= −(3)±√(3)2−4(9)(−1)

2(9)

x= −3±√45

18

x= −1

6

+

1

6

√5 or x=

−1

6

+

−1

6

√5

x=

−1

6

+

1

6

√5 or x=

−1

6

+

−1

6

√5

answer: 5100 just subtract

step-by-step explanation:

x is the total time in minutes for the free response

you are given number of questions as 15 - m and time per item as 8 minutes

to find x multiply the two givens together:

x = 8 * (15-m) = 8(15-m)