This is really similar to your standard binomial equation: ax2+bx+c. We treat it similarly. and start by factoring
We ask ourselves: can I factor THESE any further. Yes I can, so set each equation to 0 and solve again
x2-16 = (x+4)(x-4); x = ±4
x2-3 = (x+√3)(x-√3); x = ±√3
He shoots, he scores, he gets the answer! The crowd goes wild....