Take out the common factor, 3: 3x + 6 = 3(x + 2).
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sqrt(4)=2 sqrt(169)=13 (2x+13)(2x-13)
Yes, if there is no remainder after division, the divisor is a factor.
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.)
(x + 3)(4x + 5)
x2-3x+2.25 is the same as 4x2-12x+9 and is (2x-3)(2x-3) when factored