Question

solving quadratic equation x2+8x=-15 by completing sqare method,find third term.

Answer 1

x^2 + 8x + 15 = 0
=> x^2 + 2(4)x + 15 + 1 - 1 = 0
=> x^2 + 2(4)x + 16 = 1
=> (x+4)^2 = 1

Hope it will help.