so the exuation is :
2x^2+18x+40
I know I have to common factor first, but I don't know exaclly where to go from there. It's grade 10 accademic math..I duuno if that means anything?
so I put it so it was like this:
2(x^2+9x+20)
and I duuno where to go from there?
Any help would be appreciated.
Hello, smallman,
I presume that you are a little bit uncertain how to factorize
To do this probelm you must know the binomial formulae:
(a+b)² = a² + 2ab + b² [1]
(a-b)² = a² - 2ab + b² [2]
(a+b)(a-b) = a² - b² [3]
The formula [3] is very important with your problem:
1. Complete square with the first two summands by adding a third summand and subtract this summand immediately:
=
2. Unite the first three summands to a binom [1] and the last two summands to a square:
3. Now you've got a term similar to the RHS of formula [3]. Use the LHS of this formula:
4. Finally you get:
That's the TPH's result.
EB