Question

Bai ma mai ajuta cineva in viata asta...nu stiu absolut nimic in mate, va rog toate exercitiile

Answer 1

Răspuns:

1. a)2a²-3a+1-7a²+5a= -5a²+2a+1

b)3x(4x²-x)=12x³-3x²

c)(a-5)(a+3)=a²+3a-5a-3a=a²-5a

d)( 5x+4)(2x-1)=10x²-5x+8x-4=10x²+3x-4

e) (b-2)(b²+2b-3)=b³+2b²-3b-2b-4b+6=b³+2b²-6b+6.

3. b)x²-y²-x²-3y=-y²-3y=y(-1²-3)

c)2a²+2a-(a²+4a-2a-8)=2a²+2a-a²+4a-2a-8=a²+4a-8

d)y²+4y+4-2y²-4y=-y²+4