Find the product of $\left(3m-7\right)\left(2m-1\right)$.

Find the product of $\left(2x+1\right)\left(3-4x\right)$.

Find the product of $\left(4a-2b\right)\left(2a+b\right)$.

Find the product of $\left(2m-n\right)\left(-3n-4m\right)$.

Find the product of $\left(x+\frac{1}{2}\right)\left(x+\frac{1}{4}\right)$.

Find the product of $\left(2x+\frac{1}{3}\right)\left(x-\frac{1}{2}\right)$.

Find the product of $\left(2x^2-4y\right)\left(y-x^2\right)$.

Find the product of $\left(7-9b\right)\left(4b+6\right)$.

Find the product of $\left(x+y\right)\left(2y^2-4x^2\right)$.