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64x² + y² = 72
=> (8x)² + (y)² = 72
=> (8x+y)²-2.8x.y = 72
=> (8x+y)² = 72+32 [2×8x×y = 16xy = 16×2 = 32]
So, (8x+y)² = 104
(4x + y/2)² = {(8x+y)/2}² = (8x+y)²/2² = 104/2² = 104/4 = 26 [Ans.]
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