Ella completed the following work to test the equivalence of two expressions. What conclusion can you draw from Ella’s work? The expressions are equivalent because Ella got a different result when she substituted zero for f. The expressions are equivalent because Ella got the same result when she substituted zero for f. The expressions are not equivalent even though Ella got the same result when she substituted zero for f. The expressions are not equivalent because Ella did not know that you can’t use substitution to test for equivalence.