Question

Oblicz:
1.2a-(4a+5)=
2.(3x-7)-(4x+1)=
3.-3(x+5)+4(5x-7)=
4.(x-3) (2x+1)=
5.3(x+2) (2x-3)=
6.7-(x-4) (x+5)=

Answer 1

1.2a-(4a+5)= 2a - 4a - 5 = -2a - 5
2.(3x-7)-(4x+1)=3x - 7 - 4x - 1 = -x -8
3.-3(x+5)+4(5x-7)=-3x - 15 + 20x - 28 = 17x -43
4.(x-3) (2x+1)= 2x^2 + x - 6x - 3 = 2x^2 - 5x - 3
5.3(x+2) (2x-3)= 3(2x^2 - 3x + 4x - 6) = 3(2x^2 + x - 6) = 6x^2 + 3x - 18
6.7-(x-4) (x+5)= 7 - (x^2 + 5x - 4x - 20) = 7- (x^2 + x - 20) = 7-x^2 -x + 20 = -x^2 -x + 27

^ znaczy do potęgi