The square of a number is the number multiplied by itself. Therefore the square of the number 4 written normally as 42 is = 4*4 = 16.
Five more than 42 would therefore be =(4*4)+5 = 21.
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x=-3 or x=5
A beprisque number nnn is an integer which is either one more than a prime number and one less than a perfect square, or one more than a square and one less than a prime. The 5th such number is 10.
26 5*5 and 3*3*3
-4.52494 or 5.52494 (to 5 dp)
A cube