SOLUTION: when a mystery number is multiplied by its double the answer is 32 what is the number?

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Question 960116: when a mystery number is multiplied by its double the answer is 32 what is the number?
Answer by MathLover1(20850) About Me  (Show Source):
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let a mystery number be x
when it is multiplied by its double the answer is 32,
so, x%2A2x=32
2x%5E2=32
x%5E2=32%2F2
x%5E2=16
x=sqrt%2816%29
solutions: x=4 or x=-4