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Evaluate the expression 2ab3 + 6a3 - 4ab2 when a = 2 and b = 4.
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Evaluate the expression 2ab3 + 6a3 - 4ab2 when a = 2 and b = 4.

User JVS
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2ab^3+6a^3-4ab^2


Substitute the values of a = 2 and b = 4 to the expression:



2\cdot2\cdot4^3+6\cdot2^3-4\cdot2\cdot4^2\\\\=4\cdot64+6\cdot8-8\cdot16\\\\=256+48-128\\\\=176

User MahMoos
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