Question

Simplifique a fração algébrica 6a²-6b²/3.(a+b), após calcule o valor da expressão considerando: A=2 & B=1

Answer 1

Olá Rachel,


$\mathsf{\dfrac{6a^2-6b^2}{3\cdot(a+b)}\Rightarrow \dfrac{\diagup\!\!\!\!6\cdot(a^2-b^2)}{\diagup\!\!\!\!3\cdot(a+b)}\Rightarrow\dfrac{2\cdot(a-b)\cdot(a+b)}{(a+b)}\Rightarrow\boxed{\mathsf{2\cdot(a-b)}}}\\\\\\\mathsf{a=2}\\\mathsf{b=1}\\\\\mathsf{2\cdot(2-1)\Rightarrow2\cdot(1)=\boxed{\mathsf{2}}}$

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