[tex](4 - 2b) {}^{2} = {4}^{2} - 2 \times 4 \times 2b + (2b) {}^{2} = \\ = 16 - 16b + 4 {b}^{2} [/tex]
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[tex](4 - 2b) {}^{2} = {4}^{2} - 2 \times 4 \times 2b + (2b) {}^{2} = \\ = 16 - 16b + 4 {b}^{2} [/tex]