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ab = 128
(24 - b)b = 128
24b - b² = 128
b² - 24b = -128
b² - 24b + 12² = -128 + 12²
(b - 12)² = -128 + 144
(b - 12)² = 16
(b - 12) = 4
b = 16
a = 24 - b
= 24 - 16 = 8