You can
put this solution on YOUR website!
You need to find a factor of this ie a value of x that makes the whole thing zero. Since all the terms are positive, then x must be a negative value, to make the
and x negative.
As to the value of x, well this is trial and error to find, but looking at the equation, the value -3 does jump out. Put x=-3 into the expression and you do get zero. So, x+3 is a factor.
You now need to divide this into the cubic expression and then factorise the resulting quadratic, if possible. Having done this for you, the final answer is
. So try it.
Actually, there is a simpler method for this cubic:
written as
. Look the 2 sets of 2 terms and factorise each of those:
You can see that both halves have
, so we can factorise again, as
Third example looks to be like the first.
jon.
