Verified answer

Answer:

Given that;

[tex] \frac{2}{7} a(ab - \frac{7}{6} ab {}^{2} )[/tex]

for,

a = 2 and b = -5.

Putting the values of a and b in the above equation, we get,

[tex]\frac{2}{7} a(ab - \frac{7}{6} ab {}^{2} ). \\ = > \frac{2}{7} \times 2(2 \times ( - 5) - \frac{7}{6} \times 2 \times ( - 5) {}^{2} ). \\ = > \frac{4}{7} ( - 10 - \frac{7}{6} \times 50). \\ = > \frac{4}{7} ( - 10 - \frac{350}{6} ). \\ = > \frac{4}{7} ( \frac{ - 60 - 350}{6} ). \\ = > \frac{4}{7} ( \frac{ - 410}{6} ). \\ = > \frac{4}{7} ( \frac{ - 205}{3} ). \\ = > \frac{ - 820}{21} .[/tex]