5a2-15 = 5 (a2-3) = 5 (a-sqrt(3))(a+sqrt(3))
as a2-b2=(a-b)(a+b)
(x - 5)(x + 3)
(x - 5)(x - 3)
15x2 - 30x -720 = 15(x - 8)(x + 6).
3x^2 -14x +15 = (3x-5)(x-3)
What about it? Factorise it?
F(x) = 15x2 - 2.5 + 3 That's a quadratic or 2nd degree polynomial in x.
If you mean: 4x squared+7x+4 then the discriminant is -15
x = 1
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15.
5(x + 3)
(Y squared) minus (2 times Y) minus 15 = 0. The left side can be factored into: (Y - 5)(Y + 3) There are two different values for Y that will work for the above equation.