Solve (12×7×9)^(-5): Negative Exponent Calculation

Insert the corresponding expression:

(12×7×9)5= \left(12\times7\times9\right)^{-5}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:04 According to the laws of exponents, when we have a negative exponent
00:07 We can convert to the reciprocal number to obtain a positive exponent
00:11 We will apply this formula to our exercise
00:14 We'll write the reciprocal number (1 divided by the number)
00:17 Raise to the positive exponent
00:24 In order to expand parentheses of an exponent over multiplication
00:29 Raise each factor to the power
00:35 We will apply this formula to our exercise
00:42 This is the solution

Step-by-step written solution

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1

Understand the problem

Insert the corresponding expression:

(12×7×9)5= \left(12\times7\times9\right)^{-5}=

2

Step-by-step solution

Start with (12×7×9)5 \left(12 \times 7 \times 9\right)^{-5} .

Apply the power of a product property, which states (xyz)n=xn×yn×zn (xyz)^n = x^n \times y^n \times z^n :
(12×7×9)5=125×75×95 \left(12 \times 7 \times 9\right)^{-5} = 12^{-5} \times 7^{-5} \times 9^{-5}

Use the negative exponent property, an=1an a^{-n} = \frac{1}{a^n} :
125×75×95=1125×175×195 12^{-5} \times 7^{-5} \times 9^{-5} = \frac{1}{12^{5}} \times \frac{1}{7^{5}} \times \frac{1}{9^{5}}

This results in:
1125×75×95 \frac{1}{12^5 \times 7^5 \times 9^5}

Thus, the solution to the expression is 1125×75×95 \frac{1}{12^5 \times 7^5 \times 9^5} .

Keep in mind - we could have used the rules in the other way around, first the negative exponent rule, and only then the product rule and the result would still be the same!

3

Final Answer

1125×75×95 \frac{1}{12^5\times7^5\times9^5}

Practice Quiz

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\( 112^0=\text{?} \)

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