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(2x-3)(2x-3)(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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