Solve: (17^-3 × 17^3x)/17 - 17x Using Exponent Rules

173173x1717x=? \frac{17^{-3}\cdot17^{3x}}{17}-17x=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:09 In order to eliminate a negative exponent
00:12 We'll invert the numerator and the denominator in order that the exponent will become positive
00:15 We'll apply this formula to our exercise, and then convert from a fraction to a exponent
00:20 When multiplying powers with equal bases
00:23 The exponent of the result equals the sum of the exponents
00:28 We'll apply this formula to our exercise, we'll then add up the exponents
00:41 This is the solution

Step-by-step written solution

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1

Understand the problem

173173x1717x=? \frac{17^{-3}\cdot17^{3x}}{17}-17x=\text{?}

2

Step-by-step solution

Let's deal with the first term in the problem, which is the fraction,

For this, we'll recall two laws of exponents:

a. The law of exponents for multiplication between terms with identical bases:

aman=am+n a^m\cdot a^n=a^{m+n} b. The law of exponents for division between terms with identical bases:

aman=amn \frac{a^m}{a^n}=a^{m-n} Let's apply these laws of exponents to the problem:

173173x1717x=173+3x1717x=173+3x117x=173x417x \frac{17^{-3}\cdot17^{3x}}{17}-17x=\frac{17^{-3+3x}}{17}-17x=17^{-3+3x-1}-17x=17^{3x-4}-17x where in the first stage we'll apply the law of exponents mentioned in 'a' above to the fraction's numerator, and in the next stage we'll apply the law of exponents mentioned in 'b' to the resulting expression, then we'll simplify the expression.

Therefore, the correct answer is answer a.

3

Final Answer

173x417x 17^{3x-4}-17x

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

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