we know that
A function is "even" when: f(x) = f(−x) for all x
so
we have
g(x)=4x^2+3
if you substitute x for -x
g(-x)=4(-x^2)+3
the function is the same, because
g(-x)=4(x^2)+3
g(x)=g(-x)
the function is even
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