Question

2(3x+3)-4(5x-3)=x(x-3)-x(x+5)

Answer 1

6x + 6 - 20x + 12 = x² - 3x - x² - 5x
-14x + 18 = -8x
-14x + 8x = -18
-6x = - 18
x = 3

Answer 2

2(3x+3) - 4(5x - 3) = x(x - 3) - x(x+5)
6x+6 - 20x + 12 = x^2 - 3x - x^2-5x
- 14x + 18 = 0 - 8x
- 14x + 18 = - 8x
- 14x + 8x = - 18
-6x = -18
x = - 18/-6
x = 3

Comprobar:
2(3x + 3) - 4(5x-3) = x(x - 3) - x(x+5)
2(3(3)+3) - 4(5(3)-3) = 3(3-3) - 3(3+5)
2(9 + 3) - 4(15 - 3) = 3(0) - 3(8)
2(12) - 4(12) = 0 - 24
24 - 48 = - 24
- 24 = - 24 <--- Correcto.

Att: Diana ❤