factor 80x5th power -360x3rd power + 405x

Answer 1

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?

Answer 2

Oops 80/5 = 16. Makes a big difference

5x(16x^4 - 72x^2 + 81)
5x(4x^2 - 9)^2
5x(2x-3)(2x-3)(2x+3)(2x+3)

Answer 3

54x3y

Answer 4

sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)