Factor the polynomial $49x^2-36$ completely.

A physics problem gives the energy expression $E=25t^2-49$. Factor $E$, then solve for $t$ when $E=0$.

Factor $x^3+27$ fully.

Expand the expression ${(x+5)}^2$ and write the result in standard polynomial form.

If you multiply the conjugates $ax+b$ and $ax-b$, which of the following represents the correct result?