( x - 7 ) ( x - 8 )
By using distributive property, we get
[tex] \large \purple {\tt {x(x - 8) - 7(x - 8)}} [/tex]
[tex] \large \pink {\tt {or, \: {x}^{2} - 8x - 7x + 56}} [/tex]
[tex] \large \orange {\tt {or, \: {x}^{2} - x + 56}} [/tex]
[tex] \large \red {\tt {or, \: {x}^{2} - x + 56}} [/tex]