Question

Помогите пожалуйста Срочно! Даю 15 баллов

Answer 1

Лучший ответ пж.

#1

1) 7n(n³-8n²) = 7n⁴-56n³

2) (p-2)(2p+3) = 2p²+3p-4p-6 = 2p²-p-6

3) (3m-4n)(5m+8n) = 15m²+24nm-20nm-32n² = 15m²+4nm-32n²

4) (y+3)(y⁴-6) = y⁵-6y+3y⁴-18

#2

1) 12ab-18b² = 6b(2a-3b)

2) 21x⁷-7x⁴ = 7x³(3x⁴-x)

3) 8x-8y+ax-ay = 8(x-y)+a(x-y)

#3

1) (3x-5)(2x+7) = (3x+1)(2x-3)+4x

6x²+21x-10x-35 = 6x²-9x+2x-3+4x

6x²+11x-35 = 6x²-3x-3

6x²+11x-6x²+3x = -3+35

14x = 32

x = 32/14 = 2 1/7

2) 6x²-18x = 0

6x²-18x-0 = 0

D = 18²-4×6×0 = 18² = 324

x¹ = (18+√324) / 2×6 = 18+18 / 12 = 3

х² = (18-√324) / 2×6 = 18-18 / 12 = 0

Два решения: х = 3; х = 0.

#4

2m(3m-7)+(m-1)(m+5)

6m²-14m+m²+5m-m-5

7m²-10m-5