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3x^2+9x=x^2+6x+9
2x^2+3x-9=0
delta=9+72=81
pierw. z delta=9
x1=(-3-9)/4=-12/4=-3
x2=(-3+9)/4=6/4=1 1/2
2)
2x^2+7x-4≥0
delta=49+32=81
pierw. z delta=9
x1=(-7-9)/4=-16/4=-4
x2=(-7+9)/4=2/4=1/2
x€(-∞,-4> v < 1/2, +∞)