Q. Simplify the following expression to simplest form using only positive exponents.(81x16y−12)−45Answer:
Apply Negative Exponent Rule: Apply the negative exponent rule to the entire expression.The negative exponent rule states that a−n=an1. We will apply this rule to the entire expression (81x16y−12)−45.
Distribute Exponents: Distribute the exponent to each factor inside the parentheses.When raising a power to a power, you multiply the exponents. In this case, we have a product of three terms inside the parentheses, each of which will be raised to the power of −45.(81x16y−12)−45=81−45×x16⋅(−45)×y−12⋅(−45)
Simplify Each Term: Simplify each term separately.Now we simplify each term by multiplying the exponents.81−(5)/(4)=815/41x16∗(−(5)/(4))=x−20y−12∗(−(5)/(4))=y15
Convert Negative Exponents: Convert negative exponents to positive exponents.We already have y15 with a positive exponent. For x−20, we use the rule that a−n=an1 to convert the negative exponent to a positive one.x−20=x201
Calculate 815/4: Calculate 815/4. To calculate 815/4, we first find the fourth root of 81, which is 3, because 34=81. Then we raise 3 to the power of 5. 815/4=(34)5/4=35=243
Write Final Expression: Write the final expression using only positive exponents.We combine the results from the previous steps to write the final expression.81451×x201×y15=2431×x201×y15
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