1.Rozwiąż równiania i nierówności kwadratowe.
-2x²=-18/-2
x²=9
x=√9
x=3
-2x²+18 = 0 /-18
-2x² = -18 /:(-2)
x² = 9 /√
x = √9
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-2x²=-18/-2
x²=9
x=√9
x=3
-2x²+18 = 0 /-18
-2x² = -18 /:(-2)
x² = 9 /√
x = √9
x=3