It is a quadratic expression in the variable x.
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16? using 16, you have (3x2 + 4)(3x2 + 4) = 9x2 + 24x + 16
33
3x - 24x + 5 + 3 = -21x + 8
The idea is to take half the coefficient of the linear term (in this case, of 24), and square it. This will be the value for "c".
(x^2) + 24x + 144 = -9 x = -12