hello!
sorry for not being update
my exams are going on

so today
we are discussing about some more formulaes of maths
for ex:
(a+b)2=a2+b2+2ab
("here a2 means a raised to power of 2")
(a-b)2=a2+b2-2ab
and
a2-b2=(a+b)(a-b)