posted by ann .
factor 80x5th power -360x3rd power + 405x
80x^5 - 360x^3 + 405x
5x(80x^4 - 72x^2 + 81)
in parentheses is just a quadratic in x^2, so
x^2 = (9 ± 16i)/20
Now, just take the square roots of those complex numbers to get your other factors :-)
Sure there's no typo there?
Oops 80/5 = 16. Makes a big difference
5x(16x^4 - 72x^2 + 81)
5x(4x^2 - 9)^2
sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)