Penjelasan dengan langkah-langkah:
[tex]x {}^{2} - x - 72 \\ = (x - 9)(x + 8) \\ \\ x _{1} = x - 9 \\ 9 =x \\ x = 9 \\ \\ x _{2} = x + 8 \\ - 8 = x \\ x = - 8[/tex]
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Penjelasan dengan langkah-langkah:
[tex]x {}^{2} - x - 72 \\ = (x - 9)(x + 8) \\ \\ x _{1} = x - 9 \\ 9 =x \\ x = 9 \\ \\ x _{2} = x + 8 \\ - 8 = x \\ x = - 8[/tex]