[math] is the solution wrong?

[u/Happy-Dragonfruit465]

solution

my answer: 3.2-3 / 0.2, using this:

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[u/KeyRooster3533]

y is fixed at 0. so average rate of change becomes f(2.2,0) - f(2,0) / 2.2 - 2. i don't think there should be negative sign in denominator.