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Posted by **Sam** on Wednesday, May 2, 2012 at 9:55pm.

a)(2x+5)(2x-5) b) -4x^3(6x-3x^4)

show your work. please help me!!

- Math -
**Bosnian**, Wednesday, May 2, 2012 at 10:28pma )

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

2 x * 2 x + 2 x * 5 - 5 * 2 x - 5 * 5 =

4 x ^ 2 + 10 x - 10 x - 25 =

4 x ^ 2 - 25

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