Question

please please factorise it I will be very thankful​

Answer 1

Answer:

$formulas \: used \\ {(a + b)}^{2} = {a}^{2} + {b}^{2} + 2b \\ { (a-b )}^{2} = {a }^{2} + {b}^{2} - 2ab$

Step-by-step explanation:

I hope you understand that

Thank you

Answer 2

Step-by-step explanation:

(l+m)^2 = l^2 + m^2 + 2lm

substituting this in the given equation:

(l+m)^2 - 4lm = l^2 + m^2 + 2lm -4lm

= l^2 + m^2 - 2lm

= (l-m)^2

= ( l-m )(l-m)

Hope u understand!