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If your original equation was [tex]f(x) = 3(2)^x[/tex], then a reflection over the x-axis means you need all the y-values to switch sign. This means you need to multiply that function by -1.
[tex]g(x) = -1\cdot 3(2)^x[/tex] or [tex]g(x) = -3(2)^x[/tex]