Can't fathom this one:
Express in the form a + b(root c)
(root 3 + root 2) (root 3 - root 2)
Thanks!
They can be zeroes, it still gives a real solution. The original question is multiplying a surd by it's conjugate which will always give a rational answer - it's how we rationalise the denominator.
You could say that $\displaystyle 1 = 1+3\sqrt0$
As long as $\displaystyle bc = 0$ and $\displaystyle c \geq 0$ then it will work