Question

Solve x2-2x-a(a+2)=0​

Answer 1

Let a=1 b=-2 c=-(a+2)

b2-4ac=0

(-2)*(-2)- 4(-a2-2a)

4a2+8a+4=0

4a2+4a+4a+4=0(by factorization method)

4a(a+1)+4(a+1)

(4a+4)(a+1)=0

4a+4=0 or a+1=0

a=4/4=1 or a=-1