7 and -7.
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The square root of 36 and the square root of 49.
The square root of 36 is 6 and the square root of 49 is 7 These are used as 42 is between 36 and 49.
+ 6/7 and - 6/7 .
That is correct. I would say, the square root of a number is another number that, when you multiply it by itself, gives you the number you started with. Remember that a positive number always has two square roots, one positive and one negative. The square roots of 49 are 7 and -7, since 7x7=49, and also -7x-7=49.