81a^2+36a+4 a = -2/9
(9a+4)(81a2-36a+16)
4
9a4-b2=36a-2b=2(18-b) But if you meant 9a^4-b^2 it is not possible to factor
The greatest common factor of 16 20 and 36 is 4.
Not factorable
(2x + 1)(x + 4)
a2 - 4a + 4
(2x+4)(x+1)
(3x + 4)(3x + 4)
4(x + 1)(x + 1)
(x-1)(x+4)