If a - b = - 7 and a2 + b2 = 85, then find ab.
(a - b)2 = a2 + b2 - 2ab
Given, a - b = - 7 and a2 + b2 = 85
⇒ 49 = 85 - 2ab
⇒ 2ab = 36
⇒ ab = 18
3. If a + b = 11 and $a^{2} + b^{2}$ = 61, then value of ab is
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