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16x^2=25
x^2=25/16
x=5/4=1,25
4-100x^2=0
-100x^2=-4
100x^2=4
x^2=4/100
x=2/10=1/5
4x^2-121=0
4x^2=121
x^2=121/4
x=11/2
16x^2 = 25/√
4x = 5 /:4
x = 5/4
4 - 100x^2 = 0
100x^2 = -4 /√
To nie ma rozwiązania, bo nie można wyciągnąć pierwiastka z liczny minusowej
4x^2 - 121 = 0
4x^2 = 121 /√
2x = 11/:2
x = 11/2