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40=2x²+12x+x+6
2x²+13x-34=0
Δ=441
√Δ=21
x₁=-13-21/4 = -8,5
x₂=-13+21/4= 2
20=(2xkwadrat + 12x + x + 6 )1/2
20=xkwadrat + 6x + 1/2 +3
xkwadrat - 6 1/2 x=-17/ (-1)
x(x+6 1/2 ) = 17/x
x+6 1/2= 17/x
x=17/x-13/2
x-17/x=-6 1/2
-16/x=-6 1/2 / (-1)
16/x=13x
32=13x
x=2 6/13