Question

8 times of a number is added to its square gives a result -15.then find the number by using its quadratic equation

Answer 1

Answer:

x=-5,-3

Step-by-step explanation:

x²+8x=-15

=x²+8x+15=0

=x²+5x+3x+15=0

x(x+5)+3(x+5)=0

(x+5)(x+3)

x=-5,-3