Factoring
(x+15)(x-7)=0
x=-15
x=7
x2=-8x-12
x2+8x+12=0
48x-x2+100=0
x=-2
x=50
12=(x-3)2-4
x=7
x=-1
x2=14x+15
x=15
x=-1
x2-4x=0
x=0
x=4
X2-4=0
49=-m2-14m
x=-7
3x2+6=198
x=-8
x=2-2√7
(3x-2)(2x+5)=0
x=2/3
x=-5/2
x2+24=10x
x2-10x+24=0
3r2=3r-2
No solution
8x2-7=273
x=-√35
x2+16x+4=0
x=-8+2√15
x=-8-2√15