exam Maths Puzzle Numerical Ability

Evaluate:

c-bc if b = -1 and c = -2

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exam Other Question

could you please show me how to solve this problem:
(x^2-6x+8)/(x-4)
Thanks for your help in advance.
Evaluate the functions for the values of x given as 1, 2, 4, 8, and 16. Describe the differences in the rate at which each function changes with increasing values of x.

f(x) =