Factoring
15x2 +10x
5x(3x+2)
x2-5x-6=0
x=-1
x=6
(x2-3x+2)/(x2-4)
(x-1)/(x+2)
k2+10k+21
(k+3)(k+7)
10x2+31x-14
(5x-2)(2x+7)
12x2y-15x5y4+21xy7
3xy(4x-5x4y3+7y6)
7x2+31x-20=0
x=-5
x=4/7
(x2+5x+6)/(x2-49) / (x2-9)/(x2-5x-14)
(x+2)2/(x+7)(x-3)
x2-x-20
(x+4)(x-5)
40x2-28x-48
4(5x+4)(2x-3)
xy+3y+8x+24
(y+8)(x+3)
3x2+19x=14
x=-7
x=2/3
(8r+2)/6 + (r-5)/6
(3r-1)/2
x2-8x+12
(x-2)(x-6)
4x2-9
(2x+3)(2x-3)
70x2+10x-7x-1
(10x-1)(7x+1)
3x3-15x2-72x
3x(x+3)(x-8)
2y2-32
2(y+4)(y-4)
6x3-24x2+9x2-36x
3x(2x+3)(x-4)
3y2-11y+10
(3y-5)(y-2)