To square a number, multiply it by itself, so 7 squared, also written as 72, is 7 x 7, or 49.
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(9x2 + 7)(9x2 - 7) = 81x4 - 49
3.14 times 7 squared is equal to 153.86
n^3 mean a number Squared by 3
If you mean: x squared+9x+14 = 0 then by using the quadratic equation formula x = -2 or x = -7
If you mean a2 x a2... the answer is a4