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22 June, 19:45

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

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  1. 22 June, 21:00
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    Distribute:

    4a^2+4ab+b^2+-2a^2+5ab+3b^2

    Combine like terms:

    (4a^2+2a^2) + (4ab+5ab) + (b^2+3b^2)

    =2a^2+9ab+4b^2
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