What is 4b^2 + b^2?

Answer 1

B² is it's own variable, as you are not solving for B. Don't let the exponent affect how you would solve this if the equation was just "4B + B".

Just as 4B + B = 5B

Then, 4B² + B² = 5B²

Answer 2

4b² + b² = 5b²