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I am thinking of a positive number. If I square it, double the result, take half of that result, and then add 12, I get 21. What is my number?

I am thinking of a positive number. If I square it, double the result, take half of that result, and then add 12, I get 21. What is my number?
asked 234k views
5 votes
I am thinking of a positive number. If I square it, double the result, take half of that result, and then add 12, I get 21. What is my number?

asked
User Wahab Khan Jadon
by
7.8k points

1 Answer

2 votes

Answer:

3

Explanation:

work backwards.

x^2*2/2+12=21

x^2+12=21

x^2=9

x=3

answered
User Angelys
by
8.1k points
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