Grouping Expressions

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August 28th 2012, 02:42 PM
wrongnmbr

Grouping Expressions

Kind of having trouble with grouping these two expressions. Can anyone help?

−36x³ − 6x² + 6x + 1

For this one I came up with: (1 - 6x²) + (6x + 1)

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http://www.webassign.net/latexImages...0eb12b6b20.gif

And then this one, which I know I got completely wrong.
August 28th 2012, 03:03 PM
skeeter

Re: Grouping Expressions

Quote:

Originally Posted by wrongnmbr

Kind of having trouble with grouping these two expressions. Can anyone help?

−36x³ − 6x² + 6x + 1

For this one I came up with: (1 - 6x²) + (6x + 1) no

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http://www.webassign.net/latexImages...0eb12b6b20.gif

And then this one, which I know I got completely wrong.

$-6x^2(6x+1) + (6x+1) = (6x+1)(-6x^2+1) = (6x+1)(1-6x^2)$

$x^{-\frac{9}{2}}(25 + 10x + x^2) = x^{-\frac{9}{2}}(x+5)^2$
August 28th 2012, 03:04 PM
Plato

Re: Grouping Expressions

Quote:

Originally Posted by wrongnmbr

Kind of having trouble with grouping these two expressions. Can anyone help?

−36x³ − 6x² + 6x + 1

For this one I came up with: (1 - 6x²) + (6x + 1)

---

http://www.webassign.net/latexImages...0eb12b6b20.gif

And then this one, which I know I got completely wrong.

$\begin{array}{l} -36x^3-6x^2+6x+1\\-6x^2(6x+1)+(6x+1)\\-(6x+1)(6x^2-1) \end{array}$

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