It means 13 times 13 = 169
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It means 13 squared which is 132 = 169
13 squared x 4 squared is equal to 2,704.
you have to do 7 squared + 13 squared = x squared. 7 squared is 49 + 13 squared which is 169. 169+49=x squared. 218= x squared. The square root of 218 is about 14.765. So the answer should be about 15cm if the missing side is the hypotnus (the diaganal side)
If you mean: (x+3)^2 = (x+2)^2 +13 Then the value of the number x works out as 4
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