X^2 + 5 doesn't factor neatly. Applying the quadratic formula, we find two imaginary solutions: 0 plus or minus i times the square root of 5.
x = 0 + 2.23606797749979i
x = 0 - 2.23606797749979i
where i is the square root of negative one.
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x^2 -5x-6 factors to: (x-6)(x+1)
5x
If that's -144, the answer is (5x + 12)(5x - 12)
Yes, if there is no remainder after division, the divisor is a factor.
You can use 1/2? 1/2((150x4)-24) I think that'd work but I'm not sure