Question

Quanto é 4x(x+6)-x²=5x² ? *--*

Answer 1

$4x(x+6)-x^2=5x^2\\\\ 4x^2+24x-x^2-5x^2 = 0\\\\\ 4x^2-5x^2+24x= 0\\\\ -x^2+24x =0\ (-1)\\\\ x^2-24x=0\\\\ x(x-24) = 0\\\\\ \boxed{x=0}\\\\ x-24 = 0\\\\\ \boxed{x=24}$

Answer 2

4x^2+24x-x^2=5x^2
3x^2+24x-5x^2=0
-2x^2+24x=0
X^2-12x=0
X(x-12)=0
X=0 ou x=12