Answer
(a) $4a^{4}b$
(b) $8a^{9}b^{12}$
Work Step by Step
(a) $(8a^{6}b^{3/2})^{2/3}=8^{2/3}a^{6(2/3)}b^{(3/2)(2/3)}=4a^{4}b$
(b) $(4a^{6}b^{8})^{3/2}=4^{3/2}a^{6*3/2}b^{8*3/2}=8a^{9}b^{12}$
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