Show that 4x² - 20x + 25 = 0 has only one solution.
First method
4x² - 20x + 25 = 0
(2x - 5)² = 0
x = 5 / 2
Second method
4x² - 20x + 25 = 0
a = 4, b = -20 and c = 25
b² = 400
4ac = 400
b² = 4ac
-b / (2a) = 5 / 2
Solving the second quadratic equation, featuring Rouge and Blaze
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- 发布时间：2021-12-01 02:13
