1.

How the minus sign came​

Answer»

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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