You can take 7x2 out of both of those, leaving 5x4 and 1.
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7x2-19x-6 7*6=427x2-2x+21x-6[7xx 2x] [3*7x 2*3]x(7x-2)+3(7x-2)Answer: (7x-2)(x+3)
14x2-7x2-16 7x2-16 (this can't be simplified any more)
(x - 2)(7x + 15)
x2 - 2x - 14 doesn't factor neatly. Applying the quadratic formula, we find two real solutions: 1 plus or minus the square root of 15x = 4.872983346207417x = -2.872983346207417
You need space between the numbers, I am guessing you mean 12 and 14 In which case you might factor the numbers 12=22 x3 14=7x2 So the LCM is 22 x3 x7 which is 21x4 or 84