Question 126885
{{{48x^3 + 42x^2 -8x -7}}}.....group first and third term together, then group second and fourth term together

{{{(48x^3-8x)  + (42x^2 -7)}}}.....factor out common {{{8x}}} from first group, and common {{{7}}} from the second group

{{{8x(6x^2-1)  + 7(6x^2 -1)}}}.....combine like terms

{{{(8x+ 7)(6x^2 -1)}}}.....