If (a – b) = 3 and (a2 + b2) = 25, then the value of (ab)

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a – b = 3
On squaring both sides,
(a – b)² = 9
⇒ a² + b² – 2ab = 9
⇒ 25 – 2ab = 9
⇒ 2ab = 25 – 9 = 16

⇒ ab =	16	= 8
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