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x2 -10x-x = -3 -25
x2 -11x = -28
dlaej już prosto :)
x²-10x+25=x-3
x²-11x+28=0
Δ=121-112=9
√Δ=3
x₁=7 lub x₂=4
ze wzoru skr mnoz
x²-10x+25=x-3
x²-11x+28=0
Δ=121-112=9
√Δ=3
x₁=(11-3):2=4 lub x₂=(11+3):2=7