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.

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the answer to question 1 is -8, 28.

step-by-step explanation:

y=sec x is the correct answer

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step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function