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Question – Find the value of x+2y, Given • X2 + 4y2 = 40 • xy=6 Solution: Let’s take a variable z and assume that z = (x + 2y)2,  z = ( x + 2y )2  z = ( x + 2y ) ( x + 2y )  z = x ( x + 2y ) + 2y ( x + 2y )  z = x2 + 2xy + 2yx + 4y2 Rewriting the above equation as follows,  z ...
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