Question

Find a and d for the function f(x) = a cos(x) + d such that the graph of f matches the figure.

Answer 1

• a = 2
• d = 1

Explanation:

The value of d is the average of the maximum and minimum values of the graph:

d = (3 +(-1))/2 = 1

The value of 'a' is the difference between the maximum value and the value of d:

a = 3 -d = 3 -1 = 2

The required values of 'a' and 'd' are 2 and 1, respectively.