They are 7 and 8
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75 lies between two consecutive even integers, 74 and 76. The square root of 75 lies between 8 and 9.
It lies between 9 and 10. The square-root of 82 is nine point 'something'
-6 and -5, or 5 and 6.
Try it out! Take the square of several (in this case small) integers, until you find one square that is less than 15, and one that is more.
8 and 9