Question

(d) If a² + b² = 9 and ab = 4.
Find the value of 3(a + b)² – 2(a - b)²​

Answer 1

3(a+b)²-2(a-b)²

3(a²+b²+2ab)-2(a²+b²-2ab)

3(9+2(4))-2(9-2(4))

3(9+8)-2(9-8)

3(17)-2(1)

51-2

49

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Answer 2

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