Question

URGEEEEENTE
Sendo f(x) = 4x-5 , determine o valor de X , quando :
A ) f(x) = 11
B ) f(x) = 23

Answer 1

f(x) = 4x - 5

f(11) = 4(11) - 5
f(11) = 44 - 5
f(11) = 39

f(23) = 4(23) - 5
f(23) = 92 - 5
f(23) = 87

Answer 2

A)
11=4x-5

4x=11+5

x=16/4 

x=4
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B)
23=4x-5

4x=23+5

x=28/4

x=7