Question

Given the function f(x) = 3x + 5; What is the value of f(x)when x = -10?what is the value of (20)?what is the value of x when f(x)= 20?

Answer 1

First let's find the value of f(x) when x = -10:

`\begin{gathered} f(x)=3x+5 \\ f(-10)=3\cdot(-10)+5 \\ f(-10)=-30+5 \\ f(-10)=-25 \end{gathered}`

Now, finding the value of f(20):

`\begin{gathered} f(20)=3\cdot20+5 \\ f(20)=60+5 \\ f(20)=65 \end{gathered}`

Finally, finding the value of x for f(x) = 20:

`\begin{gathered} 20=3x+5 \\ 3x=20-5 \\ 3x=15 \\ x=(15)/(3) \\ x=5 \end{gathered}`