decompose 49x²+14x+1

Sorry didn't know it was called factorize, english is not my native language, thanks melody! ^^

with decompose I mean like a²+ab+b²=(a+b)²

I can factorize it for you

$$(7x+1)^2$$

Your formula is not correct

$$\boxed{(a+b)^2=a^2+2ab+b^2}$$

You are very welcome :)