Question

$(b^{-2}*b)^{2}:b^{-3}$

Answer 1

$(b^{-2}*b)^{2}:b^{-3}=(b^{-1})^2*b^3=b^{-2}*b^3=b$

Answer 2

$(b^{-2}*b)^{2}:b^{-3}$

$(b {}^{ - 1} ) {}^{2} \div b {}^{ - 3} = {b}^{ - 2} \div {b}^{ - 3} = b$