Question

calcule a equacao por favor 2X(X+4)=X(X-10)

Answer 1

 2 x (x + 4 ) = x(x - 10 )
2 x² + 8 x = x² - 10 x
2 x² - x² + 8 x + 10 x = 0
1 x² + 18 x = 0
x( x + 18 ) = 0
x = 0
x  + 18 = 0
x = - 18

S = { 0 ; - 18 }