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September 20, 2014

September 20, 2014

Posted by **kate** on Sunday, April 5, 2009 at 6:16pm.

(4^3 x 5^-2)(5^4 x 4^-5)/ 4^-3 x 5^3

and

(2^x+2) - (2^x+5) = -7

please help!:)

- exponents -
**drwls**, Sunday, April 5, 2009 at 11:30pmJust use the rules for adding and subtracting exponents of the same number, when multiplying or dividing.

(4^3 x 5^-2)(5^4 x 4^-5)/ (4^-3 x 5^3)

= 4^-2 x 5^2/(4^-3 x 5^3)

= 4^1 x 5^-1 = 4/5

Do the second problem the same way

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