Ok. I'm not getting this. Using a*(b+c) how does this relate to the textbook solution?

dy/dx = x^{2}[6(2x + 1)^{2}] + (2x + 1)^{3}(2x)

Common factor = 2x(2x + 1)^{2}

dy/dx = 2x(2x + 1)^{2}[3x + (2x + 1)]

dy/dx = 2x(2x + 1)^{2}(5x + 1)]

Is it possible someone can show my step by step?

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