If a+2b=9 and ab=7, find the value of a²+4b²
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as [a+2b]^2 = 81
a^2 + 4b^2 + 4ab = 81
as ab=7 than 4ab = 28
so it's value is a^2 + 4b^2 = 81-28
a^2 +4b^2 = 53
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Hope this will help you
ANSWER IS 53..
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