Question

c^2-8c-20=0 solve

Answer 1

(c-10)(c+2)

Answer 2

So the roots are 10 and -2, because:

c-10=0
c=10

c+2=0
c=-2

Answer 3

so the answer would be c= -2, 10?

Answer 4

c^2-8c-20=0
c^2-10c+2c-20=0
c(c-10)+2(c-10)=0
(c+2)(c-10)=0
c=-2, c=10