Posted by ann on Friday, January 20, 2012 at 1:08pm.
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
5x(2x-3)(2x-3)(2x+3)(2x+3)
54x3y
sorry that answer was wrong tis is the right one 3x(43+82/3)*(879/615=y78)
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