4m^2 + 1/m^2 when 2m + 1/m = 7
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2m+1/m=7
Squaring,both the sides in the above equation,we get----
(2m+1/m)²=(7)²
We know that (a+b)²=a²+b²+2ab
=>(2m)²+(1/m)²+2×2m×1/m=49
=>4m²+1/m²+4=49
=>4m²+1/m²=49-4
=>4m²+1/m²=45
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