Question

One of the solutions to x^2-2x-15=0

Answer 1

x^2-2x-15=0
or, x^2-5x+3x-15=0
or, x(x-5)+3(x-5)=0
or, (x-5) (x+3)=0
Either, Or,
x-5=0 x+3=0
x=5 x= -3

Answer 2

Factor the equation out into (x-5)(x+3)


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

x=5, -3