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____ = ____ mnozymy na krzyż
3x-4 i 2+3x
(2x-3)(2x+3)=(3x-4)*(3+2x), ze wzorów skróconego mnożenia
((2x)²-(3)²)=9x+6x²-12-8x
4x²-9=6x²+x-12
-2x²-x+3=0
Δ=(-1)²-4*(-2)*3
Δ=1+24=25
√Δ=5
x₁=1-5/-4=2
x₂=1+5/-4=-2/3