Hello, I need help with the following. could someone please help?
Find the linear factor of the form x-a, when a is a constant, of the cubic polynomial
and hence factorise f(x)
Begin by grouping the terms like this
now factor
You can see that (x+2) is a factor of both terms, and now it can be fatored out like so
Does that help? There are alot of ways to approach expressions of degree>2. Your goal is to know them all and to be able to know when is the right time to use the appropriate method.
Oh, I almost forgot. You need the linear factor in the form (x-a), but x+2=x-(-2), therefore a=-2
Got it?
Hi gva0324.
The constant is where Good candidates to try for are the divisors of the constant term, in this case You can also look at the polynomial and make a few eliminations. In this case, all the coefficients are positive, so you must try a negative number. Also all but one of the coefficients are even, so are no good. Therefore, you should try and and see which is 0.