Question

2x²-3x-90=0 помогите​

Answer 1

$2x {}^{2} - 3x - 90 = 0 \\ 2x {}^{2} + 12x - 15x - 90 = 0 \\ 2x(x + 6) - 15(x + 6) = 0 \\ (x + 6)(2x - 15) = 0$

1)

$x + 6 = 0 \\ x = - 6$

2)

$2x - 15 = 0 \\ 2x = 15 \\ x = 15 \div 2 \\ x = 7.5$

ответ:

$x1 = - 6 \\ x2 = 7.5$