# 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.

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