Question

Кто шарит за алгебру помогите мне

Answer 1

1)

$(3x - 5)(4x + 8) = 12x(x - 2) + 44 \\ 12 {x}^{2} + 24x - 20x - 40 = 12 {x}^{2} - 24x + 44 \\ 24x - 20x - 40 = - 24x + 44 \\ 4x - 40 = - 24x + 44 \\ 4x + 24x = 44 + 40 \\ 28x = 84 \\ x = 3$

2) a)

(4а-2b)(3a+7b)=4a×3a+4a×7b-2b×3a-2b×7b=12a²+28ab-6ab-14b²=12a²+22ab-14b²

б) (b²-4b)(7b-8b)=(b²-4b)×(-b)=-b³+4b²