Question

ajutati maaaa subpunctele a si d ​

Answer 1

Răspuns:

a) = x³+8y³-8y³ = x³

b) = (x-2)×(2³+2x²+4x+8)-(x+2)×(x²+4)=(x-2)×(2³+2x²+4x+8-(x³+4x+2x²+8))=(x-2)×(2³+2²+4x+8-x³+4-2x²-8)=(x-2)×(8-x³)=8x-x⁴-16+2x³=-x⁴+2x³+8x-16

c)= x²-2x-3x+6+x²-x-4x-4-(2x²-4x-x+2)=3x

Answer 2

Explicație pas cu pas:

a)

(x+2y)(x²-2xy+4y²) - 8y³ = x³ - 2x²y + 4xy² + 2x²y - 4xy² + 8y³ - 8y³ = x³

d)

(x-5)(x+2) - 2(x-1)(x+3) + x² = x²+2x-5x-10 - 2(x²+3x-x-3) + x² = x² + 2x - 5x - 10 - 2x² - 4x + 6 + x² = - 7x - 4