Find two number whose sum is 25 and their product is 154.
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Let the numbers be x and y
x + y = 25
x = 25 - y
..............
xy = 154
(25 - y) y = 154
25y - y² = 154
y² - 25y + 154 = 0
y = 11 or y = 14
When y = 11,
x = 25 - 11 = 14
When y = 14,
x = 25 - 14 = 11
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