Factor by Grouping 64r^3+40r^2-40r-25

$64 r^{3} + 40 r^{2} - 40 r - 25$

Step 1

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

$(64 r^{3} + 40 r^{2}) - 40 r - 25$

Factor out the greatest common factor (GCF) from each group.

$8 r^{2} (8 r + 5) - 5 (8 r + 5)$

Step 2

Factor the polynomial by factoring out the greatest common factor, $8 r + 5$ .

$(8 r + 5) (8 r^{2} - 5)$