Not sure, but.....
X(4X + 1)^2
Square first.
(4x + 1)(4X + 1)
16X^2 + 8X + 1
Distribute
X(16X^2 + 8X + 1)
16X^3 + 8X^2 + X
======.
PS: This is an expression, not an equation, so there is nothing to solve in that sense.
which process do i use first in solving this x(4x+1)^2?