Question

помогите пожалуйста.

Answer 1

1. (3x+x²)²-x²(x-5)(x+5)+2x(8-3x²) = 9x²+6x³+x⁴-x²(x²-25)+16x-6x³ =  
= 9x²+6x³+x⁴-x⁴+25x²+16x-6x³ (сокращаем) = 34x²+16x = 2х(17х+8)
2. a) 16/81-b⁴ = (4/9)²-b⁴ = (4/9-b²)(4/9+b²) = (2/3-b)(2/3+b)(4/9+b²)
    б) a²-x²+4x+4 = (a-x)(a+x)+4(x+1)