Multiply mentally.
-$\left(3 x^{2}-\frac{3}{5}\right)\left(3 x^{2}+\frac{3}{5}\right)$
A) $9 x^{2}-30 x-\frac{9}{25}$
B) $9 x^{2}+30 x-\frac{9}{25}$
C) $9 x^{2}-\frac{9}{25}$
D) $9 x^{4}-\frac{9}{25}$

Question

Quizplus · Accepted Answer

This is an application of the difference of squares formula, $a^2 - b^2 = (a - b)(a + b)$, where $a = 3x^2$ and $b = \frac{3}{5}$. The product is $9x^4 - \frac{9}{25}$.

Multiply Mentally (3x2−35)(3x2+35)\left(3 x^{2}-\frac{3}{5}\right)\left(3 x^{2}+\frac{3}{5}\right)(3x2−53​)(3x2+53​) A) 9x2−30x−9259 x^{2}-30 x-\frac{9}{25}9x2−30x−259​ B) 9x2+30x−9259 x^{2}+30 x-\frac{9}{25}9x2+30x−259​

Multiply Mentally $\left(3 x^{2}-\frac{3}{5}\right)\left(3 x^{2}+\frac{3}{5}\right)$ A) $9 x^{2}-30 x-\frac{9}{25}$ B) $9 x^{2}+30 x-\frac{9}{25}$