[tex] {b}^{2} + 2bc + c {}^{2} = 2 {}^{2} + 2 \times 2 \times ( - 5) + ( - 5) {}^{2} = 4 - 20 + 25 = 29 - 20 = 9[/tex]
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[tex] {b}^{2} + 2bc + c {}^{2} = 2 {}^{2} + 2 \times 2 \times ( - 5) + ( - 5) {}^{2} = 4 - 20 + 25 = 29 - 20 = 9[/tex]