Question

Спростити вираз: a) (c-2) (c+3) -c?;б) 7(x+8)+(х-8)(х +8);в) (×+5) 4х - (2x +5) ;г) （1-2х)(4x+2x+1)+8x8.

Answer 1

Ответ:

надеюсь помогла (вроде так)

Answer 2

a) (c-2)(c+3) - c = c(c+3) - 2(c+3) - c = c^2 + 3c - 2c - 6 - c = c^2 + 3c - 2c - c - 6 = c^2 + 0c - 6 = c^2 - 6

б) 7(x+8) + (x-8)(x+8) = 7x + 56 + (x^2 - 64) = x^2 + 7x + 56 - 64 = x^2 + 7x - 8

в) (x+5)4x - (2x+5) = 4x^2 + 20x - 2x - 5 = 4x^2 + 18x - 5

г) (1-2x)(4x+2x+1) + 8x^8 = (1-2x)(6x+1) + 8x^8 = 6x - 12x^2 + 1 - 2x = -12x^2 + 4x + 1