Question

x(x+5)-2x=28 Mas Rápido possível, alguém?

Answer 1

$x(x+5)-2x=28\\x^2+5x-2x-28=0\\x^2+3x-28=0$

Coeficientes: a = 1, b = 3 e c = -28

$\Delta=b^2-4ac\\\Delta=3^2-4.1.(-28)\\\Delta=9+112\\\Delta=121$

$x=\frac{-b+-\sqrt{\Delta}}{2a}\\\\x=\frac{-3+-\sqrt{121}}{2.1}\\\\x=\frac{-3+-11}{2}\\\\x_1=\frac{-3+11}{2}=\frac{8}{2}=4\\\\x_2=\frac{-3-11}{2}=\frac{-14}{2}=-7$

Espero ter ajudado.
Bons estudos! :)