(9n2 - 121) = (3n + 11) (3n - 11)
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(3x - 1)(3x + 1)
nine
(-9) / 3 = -3 . Minus nine divided by three is equal to minus three
72 is "seven to the second power" or "seven to the power two" or "seven squared", and when it is calculated it is "forty nine".
9/10 minus 9/15 is 3/10