(2a+3b)² - 4a (a+3b).... Pergunta de ideia demm2

October 2020 1 52 Report

(2a+3b)² - 4a (a+3b)

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MATHSPHIS

Verified answer

$(2a+3b)^2 - 4a (a+3b)=\\
\\
4a^2+12ab+9b^2-4a^2-12ab=9b^2$

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