Question

5x (x+8)= - 7 quadratic or not? explain, ​

Answer 1

Explanation:

Yes it is a quadratic equation

5x^2 + 40x = -7

5x^2 + 40x + 7 = 0

a = 5

b = 40

c = 7

-40/10 + (sqrt(1600 - 4(5)(7)))/10

-4 + (sqrt(1600-160))/10

-4 + (sqrt(1440))/10

-4 + 12(sqrt(10))/10

-4 + 6/5(sqrt(10))