Question

For showing the given quadratic equation by 'completing square method', find the third term: $x^2+8x=-15$

Answer 1

The given quadratic equation is
$x^2+8x=-15$
Third term $={(\frac{1}{2}\times \text{Coefficient of}x)}^2$
$={(\frac{1}{2}\times 8)}^2$
$=(4{)}^2=16$