Question

What is Factorise 5x+20

Answer 1

5x + 20
5(x) + 5(4)
5(x + 4)

Answer 2

So basically we want to take out the common term or "factor" it, 20 is in the 5 table right? 5x4=20 
so lets apply that to our equation, lets divide each term by 5, x+4 is what you have we cant just make the 5 go away though it is still part of this so your answer is 5(x+4)
i hope that makes sense if it doesnt comment :)