Question

ME ajudem nessas questoes:
Dada a funçao exponencial f(x)=2x²-4, DETERMINE;

A)F(2) B)F(3)

C)F(0) D)F(-1)

E)F(-2)

Answer 1

f(x) = 2x² - 4

A) f(2) = 2(2)² - 4
f(2) = 8 - 4
f(2) = 4

B) f(3) = 2(3)² - 4
f(3) = 2(9) - 4
f(3) = 18 - 4 = 14

C) f(0) = 2(0)² - 4
f(0) = 0 - 4 = - 4

D) f(-1) = 2(-1)² - 4 
f(-1) = 2(1) - 4 = - 2

E) f(-2) = 2(-2)² - 4
f(-2) = 8 - 4 = 4

Answer 2

f(x) = 2x² - 4

A)
f(2) = 2.2² - 4
f(2) = 2.4 - 4
f(2) = 8 - 4
f(2) = 4

B)
f(3) = 2.3² - 4
f(3) = 2.9 - 4
f(3) = 18 - 4
f(3) = 14

C)
f(0) = 2.0² - 4
f(0) = 2.0 - 4
f(0) = 0 - 4
f(0) = - 4

D)
f(-1) = 2.(- 1)² - 4
f(- 1) = 2.1 - 4
f(- 1) = 2 - 4
f(- 1) = - 2 

E)
f( -2) = 2.(- 2)² - 4
f(- 2) = 2.4 - 4
f(- 2) = 8 - 4
f(- 2) = 4