Multiply Mentally
- $\left(3 x^{2}-\frac{10}{7}\right)\left(3 x^{2}+\frac{10}{7}\right)$ A) $9 x^{2}+140 x-\frac{100}{49}$ B) $9 x^{2}-\frac{100}{49}$

Multiple Choice

Multiply mentally
- $\left(3 x^{2}-\frac{10}{7}\right) \left(3 x^{2}+\frac{10}{7}\right)$

A) $9 x^{2}+140 x-\frac{100}{49}$
B) $9 x^{2}-\frac{100}{49}$
C) $9 x^{2}-140 x-\frac{100}{49}$
D) $9 x^{4}-\frac{100}{49}$