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x2﹣x﹣1=0 x2+3x+2=0 2015x2+11x﹣20=0 x2+x+2=0
2x-1=x x-3=2 3x=x+5 x+3=2
3x=x+3 -x+3=0 2x=6 5x-2=8
x²+4x=10 3x²+8x-3=0 x²-2x+3=0 (x-2)(x-3)=12
x2+x+1=0 4x2+2x+1=0 x2+12x+36=0 x2+x﹣2=0
x2–3x + 4=0 x2–x–3=0 x2–12x + 36=0 x2–2x + 3=0
2x+5=1﹣x 3﹣2(x﹣1)=7﹣x x﹣2=﹣2﹣x 1﹣x=x
3(x+1)2=2(x+1) -2=0 ax2+bx+c=0 x2+2x=x2-1
3x+4y=20 4x﹣7y=3 2x﹣7y=1 5x﹣4y=6
x2+x+1=0 4x2+x+1=0 x2+12x+36=0 x2+x-2=0
x2+4x=10 3x2+8x﹣3=0 x2﹣2x+3=0 (x﹣2)(x﹣3)=12
2(12﹣x)+x=20 2(12+x)+x=20 2x+(12﹣x)=20 2x+(12+x)=20
x2+x+2=0 x2+3x+2=0 2015x2+11x﹣20=0 x2﹣x﹣1=0