Multiply two numbers differing by a small amount.
Example
{% scaleimage l18_example.png float_right %}
Step 1
Square the lowest number
{% scaleimage l18_step1.png %}
Step 2
Multiply the lowest number by the difference between the two numbers
{% scaleimage l18_step2.png %}
Step 3
Add the results of steps 1 and 2.
{% scaleimage l18_step3.png %}