I need help in this

[feral sorrel]

This question under

[fathom cape]

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[shadow halo]

Recall a property of powers:
(ab)^n = a^n b^n

Oh, and also (a^m)^n = a^(mn).

[raven sleet]

...why is it a congruence?

[shadow halo]

Rather, an identity, maybe?

[raven sleet]

Three lines, that means congruence.

[shadow halo]

It does? Hm, I'm more used to that meaning identity.
So, for example, when titrating NaOH with HCl, I write X ≡ NaOH, T ≡ HCl.

[raven sleet]

Apparently it has diverse meanings, but the two specific contexts which are the only ones I've ever seen it in are geometric or modular congruence.

Which are equivalence relations, but not actually equality.

[feral sorrel]

I found out the awnser

Awnser

(2y^3)^3= 8y^9 is because of u need to multiply the ^3x^3 so u get 9 and cube the 2 for 8 so u get 8y^9