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4x²-20x+25-10x+25+6=0
4x²-30x+56=0
Δ=b²-4ac
Δ=30²-4×4×56
Δ=900-896
Δ=4
√Δ=2
x₁=-b-√Δ:2a= 30-2:8=3,5
x₂=-b+√Δ:2a=30+2:8=4
niech t=2x-5
t²-5t+6=0
(t-2)(t-3)=0
t=2 lub t=3
2x-5=2 lub 2x-5=3
2x=7 lub 2x=8
x=3,5 lub x=4