Algebraic Expre...

The product of $$(3x^2\, -\, 5x\, +\, 6)$$ and $$-8x^3$$  when $$x=0$$ is

$$\displaystyle \left ( a+b \right )^{2}-\left ( b-a \right )^{2}$$=______

The value of $$(501)^2\,  -\, (500)^2$$ is :

If$$(3x\, -\,4)\,(5x\, +\, 7)\, =\, 15x^2\, -\, ax\, -\, 28$$ then a = .........

$$\displaystyle \left ( \frac{2}{5}ab+c \right )\left ( \frac{2}{5}ab-c \right )$$ is equal to

$$\displaystyle \left ( -a-b \right )\left ( b-a \right )$$ is equal to

$$\displaystyle \left ( x+4 \right )\left ( x-4 \right )\left ( x^{2}+16 \right )$$ is equal to:

$$a^{2} + 4a + 4$$ =

Find the missing term in the following problem:

$$\left(\displaystyle \frac{3x}{4}\, -\, \displaystyle \frac{4y}{3} \right )^2\, =\, \displaystyle \frac{9x^2}{16}\, +\, ..........\, +\, \displaystyle \frac{16y^2}{9}$$.

Find the missing term in the following problem.
$$\displaystyle {\left (\frac{3x}{4}\, -\, \frac{4y}{3} \right )^2\, =\, \frac{9x^2}{16}\, +\, .........\, +\, \frac{16y^2}{9}}$$