Let's now look at equations of the form ax² + bx = 0
If you know how to factorise, you'll be fine with this. We factorise the equation into:
This could be true when x = 0, since 0 times the bracketed term = 0. However, there remains another possibility: the bracketed term itself is 0:
We can now ignore the brackets: x + 2 = 0
So, the solutions to x² + 2x = 0 are x = 0 or 2
