How can we factorise trinomials?

For Factorizing trinomials, try to split the middle term so that we can take some terms common.
For example:
$\left(x^2\right)-7x+6=\left(x^2\right)-6x-x+6=x(x-6)-1(x-6)=(x-1)(x-6)$
Or you can factorize a polynomial by re arranging it into some identity and then factorizing it.