practical use of these formulaes

let us suppose we are calculating the value of
99*101
we can write it like this
(100-1)(100+1)
you can recall that formula and apply it{(a-b)(a+b)=a2-b2}
then the above data will be like this:
100raise to power 2  -1 raise to power 2
it will be :
100^2-1^2
10000-1=9999
i think it  will be helpful

let discuss about three variables
ex:
(a+b+c)2=a2+b2+c2+2ab+2bc+2ca
(a+b-c)2=a2+b2+c2+2ab-2bc+2ca

no need to learn these all
justt understand the concept
if a is negative simply put it -a at the value of a and so on!!!!!!!!

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)

made simple

calculations can be done fast by using simple tricks such as
squaring any number whose unit digit is 5
so the method is:
for example we are squaring 25 you all know the square so it's unit digit is 5
hence  last two digit of this square is2 and 5 for finding first digit we multiply 2("because it is first digit of 25") by the consecutive number which is 3 so no. will be 6
and the square will be
625

what is mathematics

mathematics is subject which deals with calculation.
and it is very easy subject if you have command on it.
don't worry about it just do four to five diffrent problems and you will find it very easy.

welcome to mathematics

welcome to my blog!
you will very happy to see info about mathematics