Question

$5x(x + 1) + 6 x(x + 2) = 9x(x + 3)$

Answer 1

Usaremos a distributiva


5x^2 + 5x + 6x^2 + 12x = 9x^2 + 27x

11x^2 + 18x = 9x^2 + 27x

2x^2 = 9x


Espero ter ajudado

Answer 2

Resolução :

5 x ( x + 1 ) + 6 x ( x + 2 ) = 9 x ( x + 3 )

5x + 5 + 6x + 12= 9x + 27

5x + 6x - 9x = 27 - 5 - 12

2x = 10

x = 10 / 2

x = 5