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There is a mathematical trick for those people who are most knows the math....     2+2=5 


Step 1:

-20 = -20
in step 5, you are left with a positive or a negative result. This means that your answer is wrong and you should have checked it before posting this.
see step 7 or video.... <br>same focus mathematical !!!! <br> <br>
In this case, if the 4 part of the equation will be negative, so the answer will be 0.5 = -4 - -4.5 in order to satisfy the right side of the equation. This convention applies when the 5 part of the equation is negative -5 - -4.5 = -0.5. This means that the 4 part will equal -0.5 and is satisfied. When you square root, there has to be a negative and positive answer. You have to factor out -1 from the equation to eliminate ambiguity.
I hate to throw a wrench into your instructable, but in the step giving values to &quot;a&quot; and &quot;b&quot;; &quot;a&quot; was given two different values in the same equation 4 on one side and 5 on the other. Kudos on the attempt, but but a few more &quot;confounding&quot; intermediate steps will hide the &quot;trick&quot; better.
It is mathematical trick, focus...

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