Question

quanto é (7a+1)³? pfvr me ajudem

Answer 1

$\Large\boxed{\begin{array}{l}\sf(7a+1)^3=(7a)^3+3\cdot (7a)^2\cdot 1+3\cdot7a\cdot1^2+1^3\\\sf (7a+1)^3=343a^3+147a^2+21a+1\end{array}}$