Victory at Newcastle came in the same week as Iraola announced he will be leaving at the end of the season.
The result also keeps the Cherries firmly in the hunt for European qualifying and Tavernier, who scored in the 2-1 win, said: "We’re in great form.
“It’s not luck - it’s something we’ve worked hard on to achieve on the training pitch. With the current situation, there’s extra motivation and it’s a great feeling to get three points today.
“Everyone in the dressing room isn’t surprised. Everyone knows what they’re capable of and we need to keep our performances high. Not just the starting XI but the entire squad – that’s why we won today as well. Everyone plays their part.
“Football changes very quickly. The best thing the manager has done is make us want to compete even more towards the end of the season.
"There are a lot of players who want to finish the job for him. We want to achieve as high a place as possible because it’s very tight around us and we’re all playing for the manager.”