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Solution

Solution:

Now we will estimate that by observing x it goes from 1.5 to 4.5 with y=1 as it is fixed.

f goes all the way from 9 to 16. Therefore f(4,1) is s approximately 5.

By observing y it goes from 0.5 to 1.5 with x = 4 fixed.

f goes all the way from 12 to 8. So, f(4,1) is similarly -4