Question

urgent multumesc mult​

Answer 1

Explicație pas cu pas:

1. C

y²-4y-8-(2y³+y²-3y-8) =

= y²-4y-8-2y³-y²+3y+8

= -2y³+y²-y²-4y+3y-8+8

= -2y³-y

2. A

E(x) = (5x-2)(x²-5x-2)-4 =

= 5x³-25x²-10x-2x²+10x+4-4

= 5x³-25x²-2x²-10x+10x+4-4

= 5x³-27x²

3. D

(2x²)³:(-2x)² = (2³x⁶):(2²x²) = 2x⁴