Question

Решите уравнение 3X - 10+4х² = 0​

Answer 1

Ответ:

$3x - 10 + 4x {}^{2} = 0 \\ 4x {}^{2} + 3x - 10 = 0 \\ 4x {}^{2} + 8x - 5x - 10 = 0 \\ 4x(x + 2) - 5(x + 2) = 0 \\ (x + 2)(4x - 5) = 0$

1)

$x + 2 = 0 \\ x = - 2$

2)

$4x - 5 = 0 \\ 4x = 5 \\ x = 5 \div 4 \\ x = 1.25$

ответ:

$x1 = - 2 \\ x2 = 1.25$