Question 661548
Just in case you are yet in need of understanding or a solution...
Negative exponents are the same as 1/positive exponent, so
{{{1^-3-4^-2 = 1/(1^3) - 1/(4^2) = 1/1 - 1/16}}}
Create a common denominator
{{{(1/1)(16/16) - 1/16 = 16/16 - 1/16}}}
{{{16/16 - 1/16 = 5/16}}}
Therefore,
{{{1^-3 - 4^-2 = 5/16}}}
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