Factor completely.

all variables have an exponent which follows it

20x4 - 58x5 + 42x4

it would seem to me to factor a 2x to the fourth with a result of:

2x4(10x2 - 29x + 21)

again, all variables are followed by the exponent

Any help in understanding what the problem is would be of great appreciation. To me everything appears fine. If you distribute 2x to the fourth across, you end with the original expression.

However my homework web site tells me it's incorrect so I can only trust that they are right.

thanks again.

:Edited for clarity: