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2.) f(x) = -5
f(-5) = 2(-5)² - 4
= 2(25) - 4
= 50 - 4
= 46
3.) f(x) = 2x² - 4
x(x) = 2x² - 4
x(x) = 8
x(x) = 2(8)² - 4
= 2(64) - 4
= 128 - 4
= 124
4.) f(x) = 2x² - 4
f(a) = 2a² - 4
f(a) = 14
f(a) = 2(14)² - 4
= 2(196) - 4
= 392 - 4
= 388