# Introduction to Factorising Quadratic Trinomials using Common Factors

## Transcript

I’m going to show you something like this. Now have a look it’s pretty much the same thing as what we’ve been doing but this time we’ve got c c c and extra number in front of each of these which means c is a common factor, isn’t it?

So first, if it’s a common factor we simply take c out and factorize by that number. So I’m taking c out, so now we just have x squared and here we just have a plus bx and here we just have a b. Now see how the middle part here, that’s what we’ve been doing in the very beginning just some quadratic factorization.

So don’t worry about your c leave c outside for a moment and just consider the middle part or the inside the brackets, so that one is x and x, a times b is a and b, so we just do our usual thing. We add them up, so this one is going to be x plus a, x plus b, that’s what I put here, and then we stick the c in front. So pretty much guys all we need to do is take the common factor out that’s all you need to do that’s the only difference.

So, let’s just go right into the questions because these pronumerals might get confuse you. 