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-4a^{2}b^{3}\left(-\frac{3}{8}\right)b-\left(\frac{1}{2}ab^{2}\right)^{2}
Multiply a and a to get a^{2}.
-4a^{2}b^{4}\left(-\frac{3}{8}\right)-\left(\frac{1}{2}ab^{2}\right)^{2}
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}ab^{2}\right)^{2}
Multiply -4 and -\frac{3}{8} to get \frac{3}{2}.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}\right)^{2}a^{2}\left(b^{2}\right)^{2}
Expand \left(\frac{1}{2}ab^{2}\right)^{2}.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}\right)^{2}a^{2}b^{4}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
\frac{3}{2}a^{2}b^{4}-\frac{1}{4}a^{2}b^{4}
Calculate \frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{5}{4}a^{2}b^{4}
Combine \frac{3}{2}a^{2}b^{4} and -\frac{1}{4}a^{2}b^{4} to get \frac{5}{4}a^{2}b^{4}.
-4a^{2}b^{3}\left(-\frac{3}{8}\right)b-\left(\frac{1}{2}ab^{2}\right)^{2}
Multiply a and a to get a^{2}.
-4a^{2}b^{4}\left(-\frac{3}{8}\right)-\left(\frac{1}{2}ab^{2}\right)^{2}
To multiply powers of the same base, add their exponents. Add 3 and 1 to get 4.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}ab^{2}\right)^{2}
Multiply -4 and -\frac{3}{8} to get \frac{3}{2}.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}\right)^{2}a^{2}\left(b^{2}\right)^{2}
Expand \left(\frac{1}{2}ab^{2}\right)^{2}.
\frac{3}{2}a^{2}b^{4}-\left(\frac{1}{2}\right)^{2}a^{2}b^{4}
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
\frac{3}{2}a^{2}b^{4}-\frac{1}{4}a^{2}b^{4}
Calculate \frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{5}{4}a^{2}b^{4}
Combine \frac{3}{2}a^{2}b^{4} and -\frac{1}{4}a^{2}b^{4} to get \frac{5}{4}a^{2}b^{4}.