49 x 49 = 492 = 2401
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3.14 times 7 squared is equal to 153.86
49
To square a number, multiply it by itself, so 7 squared, also written as 72, is 7 x 7, or 49.
(9x2 + 7)(9x2 - 7) = 81x4 - 49
49 same as positive seven squared