Show that 9x² - 30x + 25 = 0 has only one solution.
First method
9x² - 30x + 25 = 0
(3x - 5)² = 0
x = 5 / 3
Second method
9x² - 30x + 25 = 0
a = 9, b = -30 and c = 25
b² = 900
4ac = 900
b² = 4ac
-b / (2a) = 5 / 3
Solving the third quadratic equation, featuring Sally and Marine
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