help, how do i prove this?

[hollow lava]

Square both sides

[reef flower]

u mean like this?

[supple acorn]

yeah, have you used absolute values much before, understanding how to manipulate them is very handy

[vocal jacinth]

,, |a+b|^2 = (a+b)^2

[fallow narwhal]

maxtsg

[vocal jacinth]

i think so

one second

yes that's correct

the abs of a value squared is the same as that value squared since squaring makes it positive

,, (-a)^2 = a^2 = |a|^2

[fallow narwhal]

maxtsg