Question

9x-5x+8x-14x
3(-2a+3b)-2(-4a+5b)
(3x+4)(2x-5)
(5x-3)²+(4x+2)²

Answer 1

9x-5x+8x-14x=
4x+8x-14x=
12x-14x=
-2x

3(-2a+3b)-2(-4a+5b)=
-6a+9b+8a-10b=
2a-b

(3x+4)(2x-5)=
3x(2x-5)+4(2x-5)=
6xpatrat-15x+8x-20=
6xpatrat-7x-20

(5x-3)²+(4x+2)²=
$25x^{2} +30x+9+ 16x^{2} +16x+4 = 41 x^{2} + 46x + 13$