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Multiplication of Any Polynomial

Find the erro...

Question

Find the errors in the following mathematical sentence:
$(3 a + 4 b) (a - b) = 3 a^{2} - 4 a^{2}$

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Solution

$(3 a + 4 b) (a - b) = 3 a^{2} + a b - 4 b^{2}$ is the correct expansion of the given expression.

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