how the minus sign came
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Step-by-step explanation:
According to the formula
(a + b)² = a² + b² + 2ab
a² + b² = (a + b)² - 2ab
we know that, a + b = 3 and ab = 2
a² + b² = (3)² - 2(2)
= 9 - 4 = 5
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