5x^2+25x-111=-x^2-8x+9
5x^2+25x-111+x^2+8x-9=06x^2+33x-120=0D=33^2*4(-120)*6=1089+2880=3969x1=(-33-63):12=-8x2=(-33+63):12=2.5
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5x^2+25x-111=-x^2-8x+9
5x^2+25x-111+x^2+8x-9=0
6x^2+33x-120=0
D=33^2*4(-120)*6=1089+2880=3969
x1=(-33-63):12=-8
x2=(-33+63):12=2.5