SOLUTION: Can you help me to simplify these two negative exponents. −4d⁻²e⁻¹f³ 6x³y⁻²z²

Consider it to have a denominator of 1:



To get a factor with a negative exponent positive, move base 
and exponent from the numerator to the denominator, (or vice-versa)
and change the exponent to positive:

We move the d-2 from numerator to denominator and
change the negative exponent to positive and we have d2
in the denominator:



We move the e-1 from numerator to denominator and
change the negative exponent to positive and we have e1
in the denominator: 



We can eliminate the 1's, leaving them understood:



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6x³y⁻²z²



Consider it to have a denominator of 1:



We move the y-2 from numerator to denominator and
change the negative exponent to positive and we have y2
in the denominator:



Eliminate the 1 understood:



Edwin