5a2-15 = 5 (a2-3) = 5 (a-sqrt(3))(a+sqrt(3))
as a2-b2=(a-b)(a+b)
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5(x + 3)
-13
The GCF of 30 n^4 and 45 n^2 is 15 n^2. The GCF of 30 and 45 is 15, and n squared is a factor of n^4.
3x2-9x-30 =3x2+6x-15x-30 =3x(x+2)-15(x+2) =(3x-15)(x+2) OR 3(x - 5)(x+2)
15 is not a factor of 100.