Question

Solve x²+8x-9=0 using completely square method​

Answer 1

x2+8x−9=0

⇒x2+2×(4)×x+16−25=0

     (x+4)2=25

     (x+4)2=52

      x+4=±5

⇒x=1  and  −9

Hence, the answer is 1,−9.