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a)5x²-3125 = 0 ∆= 0² - 4(5)(-3125) ∆= 62500 x= 0±√62500 : 2(5) x= ±250 : 10 x= ±25 b)x²-3x=0 ∆= (-3)² -4(1)(0) ∆= 9 x=-(-3)±√9 : 2(1) x= 3±3 : 2 x'= 3+3 : 2 = 9:2 = 4,5 x"= 3-3 : 2 = 0:2 = 0
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a)5x²-3125 = 0 ∆= 0² - 4(5)(-3125) ∆= 62500 x= 0±√62500 : 2(5) x= ±250 : 10 x= ±25 b)x²-3x=0 ∆= (-3)² -4(1)(0) ∆= 9 x=-(-3)±√9 : 2(1) x= 3±3 : 2 x'= 3+3 : 2 = 9:2 = 4,5 x"= 3-3 : 2 = 0:2 = 0