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21 is the answer ..1521=39x39

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i hope it helped ....do thak or plssss mark as brainliest....thnx
right (39*39=1521) 1521-1500=21
plssssssss mark my answer brainliest its a keen request....and quite urgent...
The square root of 1500 is 38.7298334...

Thus the next perfect root will be 39

Square of 39 is 1521

Thus we need to add (1521-1500=21) to 1500 to make it a perfect square...
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