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Ligning:
-3a(a+b)-2(a+b)2^

[tex]{ - 3a(a + b) - 2(a + b)^2 \cr = - 3a^2 - 3ab - 2(a^2 + 2ab + b^2 ) \cr = - 3a^2 - 3ab - 2a^2 - 4ab - 2b^2 \cr = - 7ab - 5a^2 - 2b^2 \cr} [/tex]