Question

how we take common in factorisation

Answer 1

in question 4
simply use formula (px^2+ px+p)
in question 5.
use possible factors of constant number in the form of p(x)

Answer 2

Hey mate, here is your answer.: -)

To factorise an algebraic expression, take out the highest common factor and place it in front of the brackets. Then the expression inside the brackets is obtained by dividing each term by the highest common factor...

HOPE it helps to you!!!