In 2015the city was infested with 8 * 10 ^ 7 zombies. What a change from the year before! In 2014, the city was infested with 4 * 10 ^ 2 zombies. How many times more infested the city in 2015, compared with 2014? Show your steps in the box below

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

slope is 35 and 20 miles is the y-intercept.

step-by-step explanation: