Goals from Neymar, Philippe Coutinho and Paulinho saw the host stay top of CONMEBOL qualifying, while Argentina is sixth – a point behind fifth-placed Chile.
Ahead of a clash against Colombia on Wednesday, Bauza said his team's hopes were still in its own hands.
"In three days we have another match," he said.
"We know that qualification depends on us."
Brazil struck twice in the first half and a Paulinho goal just before the hour-mark sealed the result.
Bauza lamented how much space his team gave their opponents, saying: "With the result, I had to take risks.
"But it was a match with plenty of space for Brazil."
It will make three changes. Banega, Pratto and Mercado from the beginning.