factor each of the following polynomials.

a. 20x³–10x²–30
b. x²+8x+16
c. 2x²–19x+42
d. 2m³–50m
e. 64x²–81z²
f. (y+1)²–16
g. 9x⁴–81
h. 6x²+11ab–28b²
I. 4x²+5x+1​