x²-25=0
x²=25
x'=√25=5
x"=-√25=-5
3x²-81=0
3x²=81
x²=81/3
x²=27
x'=√27=3√3
x"=-√27=-3√3
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x²-25=0
x²=25
x'=√25=5
x"=-√25=-5
3x²-81=0
3x²=81
x²=81/3
x²=27
x'=√27=3√3
x"=-√27=-3√3