Easy, peasy!
x2 + 7x - 144 = (x + 16)(x - 9).
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(x - 12)(x + 12)
108
Since 24 is a factor of 144 (24 * 6 = 144), 24 is the greatest common factor. ■
160 - 16 = 144
x2_12x-3 = 0 Using the formula for solving quadratics: x = 12 plus/minus sqrt (144 - (4 x 1 x -3))/2 x = 12 plus/minus (sqrt 156)/2 x = 12 + (sqrt 156)/2 = 12.25 or x = 12 - (sqrt 156)/2 = -0.25