Posted by Leo on Thursday, November 8, 2007 at 3:59pm.
No, 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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