Question

A lei de formação de uma função é f(x)=5x+2, então f(3/4) é:
a)23/2 b) 17 c) 23/4 d) 6
R= C

Answer 1

$\large\boxed{\begin{array}{l}\rm f(x)=5x+2\\\rm f\bigg(\dfrac{3}{4}\bigg)=5\cdot\bigg(\dfrac{3}{4}\bigg)+2\\\\\rm f\bigg(\dfrac{3}{4}\bigg)=\dfrac{15}{4}+2\\\\\rm f\bigg(\dfrac{3}{4}\bigg)=\dfrac{15+8}{4}\\\\\rm f\bigg(\dfrac{3}{4}\bigg)=\dfrac{23}{4}\\\huge\boxed{\boxed{\boxed{\boxed{\rm\dagger\red{\maltese}~\blue{alternativa~c}}}}}\end{array}}$