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October 24, 2014

October 24, 2014

Posted by **Leo** on Thursday, November 8, 2007 at 3:59pm.

Expand (5 - 2x) Squared

(5 - 2x) (5 - 2x)

5 sqrd + 5 X - 2x + -2x x 5 + -2x X -2x

so

5 Sqrd - 10x - 10x + 4X

= 5 sqrd + 4x

Am I right..thank you :-)

- Algebra -
**Reiny**, Thursday, November 8, 2007 at 5:29pmNo, you should use FOIL

F - multiply the Firsts

O - multiply the Outers

I - multiply the Inners

L - multiply the Lasts

so (5 - 2x) (5 - 2x)

= (5)(5) + (5)(-2x) + (-2x)(5) + (-2x)(-2x)

= 25 - 20x + 4x^2

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