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2x^2 - 5x = 0
2x (x - 5/2) = 0
x = 0 lub x = 5/2
b) 8x = (1/2)x^2 | × 2
x^2 = 16x
x^2 - 16x = 0
x (x - 16) = 0
x = 0 lub x = 16
c) (9/49) x^2 - 81 = 0 | ÷ 9
(1/49) x^2 = 9
(1/7)x = 3 lub (1/7)x = -3
x = 21 lub x = -21