Evaluate using the identity (a + b)2 = a2 + 2ab + b2(5a – 4b)2

1.	Evaluate using the identity (a + b)2 = a2 + 2ab + b2(5a – 4b)2
Answer» (a – b)² = a² – 2ab + b² Here a = 5a, b = 4b (5a – 4b)² = (5a)² – (2)(5a)(4b) + (4b)² = 25a² – 40ab + 16b²

Answer»

(a – b)² = a² – 2ab + b²

Here a = 5a, b = 4b

(5a – 4b)² = (5a)² – (2)(5a)(4b) + (4b)²

= 25a² – 40ab + 16b²

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