Question

Please help asap (30 ponts)

Answer 1

If we get

Explanation:

Answer 2

If
`f(x)=3(x+5)+(4)/(x)` we get
`\mathbf{f(a+2)=(3a^2+27a+46)/(a+2)}`

Explanation:

We are given the function:
`f(x)=3(x+5)+(4)/(x)` we need to find the value of f(a+2)

For finding the value of f(a+2) we will put x= a+2

We have
`f(x)=3(x+5)+(4)/(x)`

Put x = a+2

`f(a+2)=3(a+2+5)+(4)/(a+2)\\Solving:\\f(a+2)=3(a+7)+(4)/(a+2)\\Taking\:LCM\\f(a+2)=(3(a+7)(a+2)+4)/(a+2)\\f(a+2)=(3(a^2+2a+7a+14)+4)/(a+2)\\f(a+2)=(3(a^2+9a+14)+4)/(a+2)\\f(a+2)=(3a^2+27a+42+4)/(a+2)\\f(a+2)=(3a^2+27a+46)/(a+2)`

So, If
`f(x)=3(x+5)+(4)/(x)` we get
`\mathbf{f(a+2)=(3a^2+27a+46)/(a+2)}`