Difference between revisions of "2016 AMC 10A Problems/Problem 2"

Revision as of 17:17, 16 June 2020

Problem

For what value of $x$ does $10^{x}\cdot 100^{2x}=1000^{5}$ ?

$\textbf{(A)}\ 1 \qquad\textbf{(B)}\ 2\qquad\textbf{(C)}\ 3\qquad\textbf{(D)}\ 4\qquad\textbf{(E)}\ 5$

Solution 1

We can rewrite $10^{x}\cdot 100^{2x}=1000^{5}$ as $10^{5x}=10^{15}$ : $\begin{split} 10^x\cdot100^{2x} & =10^x\cdot(10^2)^{2x} \\ 10^x\cdot10^{4x} & =(10^3)^5 \\ 10^{5x} & =10^{15} \end{split}$ Since the bases are equal, we can set the exponents equal, giving us $5x=15$ . Solving the equation gives us $x = \boxed{\textbf{(C)}\;3}.$

Solution 2

We can rewrite this expression as $\log(10^x \cdot 100^{2x})=\log(1000^5)$ , which can be simplified to $\log(10^{x}\cdot10^{4x})=5\log(1000)$ , and that can be further simplified to $\log(10^{5x})=5\log(10^3)$ . This leads to $5x=15$ . Solving this linear equation yields $x = \boxed{\textbf{(C)}\;3}.$

Video Solution

https://youtu.be/VIt6LnkV4_w?t=044

~IceMatrix

https://youtu.be/SZNMHoYzPDs

~savannahsolver

2016 AMC 10A (Problems • Answer Key • Resources)
Preceded by Problem 1	Followed by Problem 3
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All AMC 10 Problems and Solutions

2016 AMC 12A (Problems • Answer Key • Resources)
Preceded by Problem 1	Followed by Problem 3
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25
All AMC 12 Problems and Solutions

The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.

@@ Line 17: / Line 17: @@
 ==Solution 2==
-We can rewrite this expression as <math>log(10^x \cdot 100^{2x})=log(1000^5)</math> , which can be simplified to <math>log(10^{x}\cdot10^{4x})=5log(1000)</math>, and that can be further simplified to <math>log(10^{5x})=5log(10^3)</math> . This leads to <math>5x=15</math>. Solving this linear equation yields <math>x = \boxed{\textbf{(C)}\;3}.</math>
+We can rewrite this expression as <math>\log(10^x \cdot 100^{2x})=\log(1000^5)</math> , which can be simplified to <math>\log(10^{x}\cdot10^{4x})=5\log(1000)</math>, and that can be further simplified to <math>\log(10^{5x})=5\log(10^3)</math> . This leads to <math>5x=15</math>. Solving this linear equation yields <math>x = \boxed{\textbf{(C)}\;3}.</math>
+==Video Solution==
+https://youtu.be/VIt6LnkV4_w?t=044
+~IceMatrix
+https://youtu.be/SZNMHoYzPDs
+~savannahsolver
 ==See Also==

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