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12+8x+6x+4x²-12-44=0
4x²+14x-44=0 /÷4
x²+7\2x-11
√Δ=(7\2)²-4*1*(-11)=49\4+44=49\4+176\4=√225\4=15\2
x1=-b-√Δ \2a=-7\2-15\2 \ 2 =-22\2/2= -11\2 (czyli to odpada bo jest minusowe)
x2=-b+√Δ\2a=-7\2+15\2 \ 2=4\2=2
x; (to jest szer.chodnika)
x=2