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December 20, 2014

December 20, 2014

Posted by **MJ** on Sunday, March 7, 2010 at 2:35pm.

1) 7.7^2-2.3^2

2) 43*56+43*44

I know how to do these manually but not by factorization.

- Math -
**Reiny**, Sunday, March 7, 2010 at 2:44pmthese questions have been 'fudged' so that they can be done mentally by using basic factoring techniques.

for the first

7.7^2-2.3^2 , I see the difference of squares

= (7.7 + 2.3)(7.7-2.3)

= 10 (5.4)

= 54

the last one uses 'common factoring'

43*56 + 43*44

= 43(56+44)

= 43*100

= 4300

- Math -
**MJ**, Sunday, March 7, 2010 at 2:55pmthanks for helping.

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