Question 359574
Up to hjere, you were golden
{{{100=(x^2-20x+100)5}}}
Then you added 5. That 5 at the end is multiplying the other terms.
{{{100=(x^2-20x+100)5}}}
{{{20 = (x^2-20x+100)}}}
{{{0 = (x^2-20x+80)}}}
*[invoke quadratic "x", 1, -20, 80 ]

So the two possible answers are 14.5 and 5.5
Since 5.5-10 would be negative, the only possible option is 14.5
14.5-10 = 4.5
Does 4.5 * 4.5 * 5 end up being close to 100?