[tex](c - 7) {}^{2} = c {}^{2} - 2 \times c \times 7 + 7 {}^{2} = {c}^{2} - 14c + 49[/tex]
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[tex](c - 7) {}^{2} = c {}^{2} - 2 \times c \times 7 + 7 {}^{2} = {c}^{2} - 14c + 49[/tex]