Question

 Como Resolver o segundo tipo de equação x(x+2)=2x+25 ?

Answer 1

$x(x+2)=2x+25\\\\\\ x^{2} +2x=2x+25\to \\\\ x^{2} +2x-2x-25=0\to \\\\ x^{2} -25=0\to \\\\ x^{2} =25\to \\\\ x= \pm \sqrt{25} \to x=\pm 5\\\\\\ S=(-5;5)$