Question

Prove algebraically that y=x^2-4 is symmetric with the y-axis.
Please help! Thanks
let f(x) = x^2 - 4

f(a) = a^2 - 4
f(-a) = a^2 - 4

if for some function f(x),
f(a) = f(-a) then the function is symmetric about the y-axis
(by definition)

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