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.)
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You can't really factor this polynomial neatly because it has one real root (between 2 and 3) and three imaginary roots.
The other factor is 1.
No, but 25 is a multiple of 5 because 5*5 = 25
12n2 plus 8n?
(a + 2b)(c + 2d)
6x(3x2 - x + 4)