Homework Help: Math

Posted by Dakota on Thursday, October 15, 2009 at 2:25pm.

7 to the power of - 2
_______________________

7 to the power of - 4

could you show me how you get 49 as the naswer...the long line shows that you need to divide both of them

Math - MathMate, Thursday, October 15, 2009 at 3:31pm
If you see a negative exponent in the numerator, it is the reciprocal of the number without the negative sign in the exponent. Namely:

A^-b = 1/A^b
or
1/A^-b = A^b

Therefore
7^-2 / 7^-4
=7⁴ / 7²
=?

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