Question

1) найдите произведение многочленов (2а-1)(а+2) 2) решите уравнение (2х²+5х-3)-2(х²+х+4)=0

Answer 1

$1) \\ (2a - 1)(a + 2) = 2a \times a + 2a \times 2 - 1 \times a - 1 \times 2 = {2a}^{2} + 4a - a - 2 = {2a}^{2} + 3 a - 2 \\ \\ 2) \\ 2 {x}^{2} + 5x - 3 - 2( {x}^{2} + x + 4) = 0 \\ {2x}^{2} + 5x - 3 - 2 {x}^{2} - 2x - 8 = 0 \\ 3x - 11 = 0 \\ 3x = 11 \\ x = \frac{11}{3} = 3 \frac{2}{3}$