Question 1084713


{{{42r^3-49r^2+18r-21}}}............rearrange terms

{{{42r^3+18r-49r^2-21}}}........group

{{{(42r^3+18r)-(49r^2+21)}}} ...factor out common terms

{{{6r(7r^2+3)-7(7r^2+3)}}}

{{{(6r - 7) (7r^2 + 3)}}}