By substituting the input value or the value of variable 'x' in a function f(x), we can find the output value of the function.
By this process, f(0) = -1
f(8) = 127
f(-3) = 17
f(-2) = 7
Given function in the question is,
f(x) = 2x² - 1
For x = 0,
f(0) = 2(0) - 1
= -1
For x = 8,
f(8) = 2(8²) - 1
= 127
For x = -3,
f(-3) = 2(-3)² - 1
= 17
For x = -2,
f(-2) = 2(-2)² - 1
= 7
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