Multiplying
(x+7)(x-7)
x2-49
(14x+5)+(10x+5)
24x+10
(3x+4)-(1x+6)
2x-2
(2x-3)2
4x2-12x+9
(17x2+11)+(8x2+11)
25x2+22
(6x+14)-(9x+5)
-3x+9
(5x-3)2
25x2+9
(9x2+12)+(7x2+10x+13)
16x2+10x+25
(14x2+13x+12)-(7x2+20x+4)
7x2-7x+8
(5x-3)(2x+7)
10x2+29x-21
(4x2-6x+7)+(-19x2-15x-18)
-15x2-21x-11
(17x2+7x-14)-(6x2-5x-18)
11x2+2x+4
(2x+8)(x-3)
2x2+2x-24
(5x6+9x3-6x)+(-9x6-20x2-6x)
-4x6+9x3-20x2
(18x2+4x-16)-(15x2+4x-13)
-3x2-3