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Algebra 1MediumWhere the Formulas Come From

Where the Formulas Come From · Medium problem

A student expands (2x+6)2(2x + 6)^2 like this:

Step 1. (2x+6)2=(2x)2+(6)2(2x + 6)^2 = (2x)^2 + (6)^2

Step 2. =4x2+36= 4 x^{2} + 36

Which step is wrong, and what is the correct expansion?

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