Simplify (2a-3b) (- 2a-3b) + (- 2A + b) ^ 2

(2a-3b)(-2a-3b)+(-2a+b)^2
=-(2a-3b)(2a+3b)+(-2a+b)^2
=-(4a^2-9b^2)+4a^2-4ab+b^2
=-4a^2+9b^2+4a^2-4ab+b^2
=10b^2-4ab
A very simple square difference formula combines the same kind of terms

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