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You can see and tell that it is \(\pm 13\)
just divide 169 by 13 because 13*13 equals 169.
for another way, look up "Newton-Raphson" method... long winded but will work out all square roots for you, eg sqrt 3, sqrt 168
How would I find out that it's 13x13?
square roots are just something i memorize
Is that the only way? to memorize?
or there is also jack's way, but it is very long winded
guesstimating you know 10^2 = 100, so must be bigger you know 15^5 = 225, so must be smaller, leaves a range of 4 possibilities
Also, you know that it must end with either a three or a seven. And since you know it has to be greater than 10 and less than 15 your only choice is 13
or you could get a pile of 169 rocks, and see how many even piles of the same number of rocks as piles you can split them in to...?
jack that would take a lot of time lol :)
type in calculator derp?