Answer to Question #263947 in Algebra for Afaq

Question

Qs=-x^2 +600x +25

Answer 1

$-x^2 +600x +25=0$

$x=\frac{600\pm \sqrt{360000+100}}{2}$

$x_1=205,x_2=395$

$Q_s=-(x-205)(x-395)$