2x²+6x-9/2<0 /*2
4x²+12x-9<0
Delta=144-4*4*(-9)
Delta=144+144
Delta=288
√288=√4*4*18=4√18=4√9*2=12√2
x1=(-12+12√2)/8=(-6+6√2)/4=(-3+3√2)/2
x2=(-12-12√2)/8=(-6-6√2)/4=(-3-3√2)/2
xE([-3-3√2]/2;-oo)
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2x²+6x-9/2<0 /*2
4x²+12x-9<0
Delta=144-4*4*(-9)
Delta=144+144
Delta=288
√288=√4*4*18=4√18=4√9*2=12√2
x1=(-12+12√2)/8=(-6+6√2)/4=(-3+3√2)/2
x2=(-12-12√2)/8=(-6-6√2)/4=(-3-3√2)/2
xE([-3-3√2]/2;-oo)