sqrt(4)=2
sqrt(169)=13
(2x+13)(2x-13)
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Yes, if there is no remainder after division, the divisor is a factor.
Take out the common factor, 3: 3x + 6 = 3(x + 2).
you can factorise 5x2-24x-12 if you use the quadratic formula: This goes to (24(+/-)sqrt(816))/(10) =5.257 or -0.4566 (4s.f.)
The GCF is 4.
If that's + 80, the answer is -4(x + 5)(x - 4)