3x^2-2x-1=0
I've completely forgotten how to factor more complex quadratic equations such as this. Please help. Thank you.
Hi!
You can solve , that is, find the roots of the polynomial. This can be done by using the quadratic formula:
This will give you two roots. Call these roots a and b (assuming here that ). So you polynomial can be written
We do the same with your polynomial:
Now using the quadratic formula we get: , which gives the two solutions
So we can factor your polynomial as , and we multiply it out we indeed get what we started with.