Question

Помогите срочно!!!!!!!!!

Answer 1

1

a) a(x + b) = ax + ab

b) k(x - y + 3) = kx - ky - 3k

c) 5y^2(y - 4) = 5y^3 - 20y^2

d) 5a(a^2 - 3a - 4) = 5a^3 - 15a^2 - 20a

2

a) 3(y + 5) - 2(y - 6) = 3y + 15 - 2y + 12 = y + 27

b) 4x(x - 2) - 5x(x - 1) = 4x^2 - 8x - 5x^2 + 5x = -x^2 - 3x

3

a) (x + 2)(x - 8) = x^2 - 8x + 2x - 16 = x^2 - 6x - 16

b) (2a - 1)(3a + 7) = 6a^2 + 14a - 3a - 7 = 6a^2 + 11a - 7

c) (3x^2 - 2)(2x + 3) = 6x^3 + 9x^2 - 4x - 6

4

(3x + 5)(4x - 1) = (6x - 3)(2x + 7)

(3x + 5)(4x - 1) - (6x - 3)(2x + 7) = 0

12x^2 - 3x + 20x - 5 - (12x^2 + 42x - 6x - 21) = 0

12x^2 - 3x + 20x - 5 - 12x^2 - 42x + 6x + 21 = 0

-19x + 16 = 0

-19x = -16

x = 16/19