Posted by ann on Friday, January 20, 2012 at 1:08pm.
factor 80x5th power 360x3rd power + 405x

algebra  Steve, Friday, January 20, 2012 at 2:19pm
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?

algebra  Oops  Steve, Friday, January 20, 2012 at 2:21pm
Oops 80/5 = 16. Makes a big difference
5x(16x^4  72x^2 + 81)
5x(4x^2  9)^2
5x(2x3)(2x3)(2x+3)(2x+3)

algebra  Derek, Friday, January 20, 2012 at 5:18pm
54x3y

algebra  Derek, Friday, January 20, 2012 at 5:23pm
sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)
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