Question

which on is correct a^2=
( 1 ). a*a = a^2

(2). (-a) *(-a) = a^2

Answer 1

both are correct ....

Answer 2

Hey friend, Harish here.

Here is your answer:

Actually both the options are correct.

Because:

1) a × a = a²   Which is definitely true.

2) We know that, -1 × -1 = +1 .

So, -a × -a = (a × -1) (a × -1) = (a × a) (-1 × -1) = a² × 1 = a².

Therefore both the options are true.
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Hope my answer is helpful to you.