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Question

Solve for x:

2x=x3

A
{1,9}
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B
{1,9}
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C
{9}
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D
{1,9}
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Solution

The correct option is B {1,9}
Given equation is 2x=x3
By squaring on both sides of equation, we get
4x=x26x+9
x210x+9=0
Now the above equation can be solved for x by writing equation as (x9)(x1)=0.
Therefore, solutions are {1,9}.

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