How do you factor #3x^2-2x-8#?
The solution is:
The polynomial is of the type
There are two ways to factor.
The first one:
we have to find two numbers whose sum is
The couple of numbers whose sum is
Now we have to "split" the monomial
So our polynomial becomes:
If it is known the way to solve an equation of 2° degree, here there is the second way to factor it:
We can imagine that this polynomial "becomes" an equation:
and than we have to use this formula:
And now we have to use the formula: