The difference of the square of a number and 18 is equal to 3 times that number. Find

the positive solution.

6.

Step-by-step explanation:

To solve this, you can set up an equation as such:

x²-18 = 3x

Now, rearrange this to make it an equation in standard form:

x²-3x-18=0.

Simply turn this equation into factored form:

(x-6) (x+3) = 0.

The only positive solution here is x=6.