if a^2 +b^2=9 and ab=4 find the value of 3(a+b)^2 -2(a-b)^2
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Answer to your given question is in the pic . please refer it . if you'll find it up to the mark . mark my answer brilignt
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Step-by-step explanation:
a ²+ b² =9
ab= 4
(a+b)²=a²+b²+2.a.b
=> 9+2×4
=>17
(a-b)² = a²+b²-2.a.b
=> 9-2×4
=> 1
3(a+b)² - 2(a-b)²
=>3×17 - 2×1
=>51 - 2
=> 49
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