Question

Solve x^2 - 121 = 0

Answer 1

11 ?

Answer 2

Hi,
do u know how to write 121 as a square of another number ... i.e
121 = x^2
wht will be "x"?

Answer 3

11

Answer 4

a^2 - b^2 = (a+b)*(a-b)
So, x^2 - 121 can be written as (x)^2 - (11)^2
So, it is (x+11)*(x-11) = 0
Therefore,
(x+11)=0
x = -11
and
(x-11)=0
x = 11

Answer 5

Thanks Guyss ! @Dharmaputra_993 & @***[ISURU]***