Question

3- Determine f-1 (-3) + f-1 (5), sabendo que f(x) = 5x – 4.

Answer 1

Resposta:

Explicação passo-a-passo:

$f^-^1 ==> x= 5.y - 4\\f^-^1 ==> (x + 4 )/ 5 =y\\f^-^1 = (x+4)/5\\\\f^-^1 (3) = (3+4)/ 5 \\f^-^1 (3)= 7/5\\\\f^-^1 (5) = (5+4)/5 \\f^-^1(5)= 9/5\\\\f^-^1(3) + f^-^1(5)= 7/5 + 9/5\\\\\\f^-^1(3) + f^-^1 (5) = 16/5$