Question

2. Which of the following ordered pairs is a solution to f(x) = 322 – 1?O (5, 19)O (1, 13)O (0,5)O (-2, 11)

Answer 1

Let's evaluate the function in each point

a) 19 = 3(5)2 - 1

19 = 3(25) - 1

19 = 75 - 1

19 = 74 it is not a solution

b) 13 = 3(1)2 - 1

13 = 3 - 1

13 = 2 it is not a solution

c) 5 = 3(0)2 - 1

5 = 0 - 1

5 = -1 it is not a solution

d) 11 = 3(2)2 - 1

11 = 3(4) -1

11 = 12 - 1

11 = 11 as the numbers are the same this is the solution