Question 50544
key form: (a + b)(a - b) = a^2 - b^2
ex.) (2x - 1)(2x + 1) = 4x^2 - 1
ex.) (x - 3)(x + 3) = x^2 - 9
(100x^2 - 3) = (10x - sqrt(3))(10x + sqrt(3))
Works the other way.