Question

(8x + 2) . (5 - 3x) = 21

Answer 1

Explicación paso a paso:

$(8x + 2) \times (5 - 3x) = 21 \\ 40x - 24 {x}^{2} + 10 - 6x = 21 \\ - 24 {x}^{2} + 34x - 11 = 0 \\ - 12x \: \: \: \: \: \: \: - 11 \\ 2x \: \: \: \: \: \: \: \: 1 \\ ( - 12x - 11)o(2x + 1) = 0 \\ x = \frac{11}{ - 12} \: o \: x = \frac{1}{2} </p><p>$