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March 5, 2015

March 5, 2015

Posted by **Marty** on Tuesday, September 4, 2007 at 5:24pm.

Help! I have no clue how to factor this! Do i have to square root everything?

- Math -
**mathstudent**, Tuesday, September 4, 2007 at 5:27pm(x^2 + 5)(x^2 - 4)

If you set y = x^2 and look at the original as:

y^2 + y - 20

It should factor easily to

(y + 5)(y - 4)

which equals:

(x^2 + 5)(x^2 - 4)

- Math -
**Marty**, Tuesday, September 4, 2007 at 5:29pmso would the final answer be (x^2 + 5)(x^2 - 4) or (y + 5)(y - 4) ???

- Math -
**mathstudent**, Tuesday, September 4, 2007 at 5:48pmThe final answer is

(x^2 + 5)(x^2 - 4)

If you multiply that, you will get your original equation.

- Math -

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