Step-by-step explanation:
[tex]x {}^{2} = - 8x - 7[/tex]
[tex]x {}^{2} + 8x + 7 = 0[/tex]
[tex]x {}^{2} + 8x + b {}^{2} = - 7[/tex]
[tex]x {}^{2} + 8x + 16 = - 7 + 16[/tex]
[tex](x + 4) {}^{2} = 9[/tex]
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