Question

Помогите с уравнением пожалуйста!
4х(х+1)=15​

Answer 1

Ответ:

$4x(x + 1) = 15 \\ 4x {}^{2} + 4x = 15 \\ 4x {}^{2} + 4x - 15 = 0 \\ 4x {}^{2} + 10x - 6x - 15 = 0 \\ 2x(2x + 5) - 3(2x + 5) = 0 \\ (2x + 5)(2x - 3) = 0 \\ 2x + 5 = 0 \\ x = - \frac{5}{2} \\ 2x - 3 = 0 \\ x = 3$

x1=-5/2

x2=3