Question

Se f(x)=x elevado a 2 -1 calcule o valor de f(3)+f(4).

Answer 1

f(x) = x² - 1

f(3) + f(4)

f(x) = x² - 1
f(3) = 3² - 1
f(3) = 9 - 1
f(3) = 8

f(4) = 4² - 1
f(4) = 16 - 1
f(4) = 15

f(3) + f(4) = 8 + 15 = 23

R.: f (3) + f(4) = 23