Factor $LaTeX: \displaystyle - 64 x^{3} + 80 x^{2} + 56 x - 70$ .

Factoring out the GCF $LaTeX: \displaystyle -2$ from each term gives $LaTeX: \displaystyle -2(32 x^{3} - 40 x^{2} - 28 x + 35)$ . Grouping the first two terms and factoring out their GCF, $LaTeX: \displaystyle 8 x^{2}$ , gives $LaTeX: \displaystyle 8 x^{2}(4 x - 5)$ . Grouping the last two terms and factoring out their GCF, $LaTeX: \displaystyle -7$ , gives $LaTeX: \displaystyle -7(4 x - 5)$ . The polynomial now has a common binomial factor of $LaTeX: \displaystyle 4 x - 5$ . This gives $LaTeX: \displaystyle -2[8 x^{2} \left(4 x - 5\right) -7 \cdot \left(4 x - 5\right)] = -2\left(4 x - 5\right) \left(8 x^{2} - 7\right)$ .