Question

calcule o valor de m na equaçao (m-6)x2-mx-8=0 para que a soma seja igual a 7

Answer 1

(m-6)x2-mx-8=0
-5m-mx+2x-8=0
6+2x-8=0
2X=+8+6
2X=14
X=14/2
x=7

Answer 2

$S= \frac{-b}{a} =7$

$\frac{m}{m-6} =7$

$m=7m-42$

$-6m=-42$

$m= \frac{-42}{-6}$

$m=7$