Writing and interpreting functions

Given g(x) = -7x - 9 and f(x) = -4, find (g*f)(x)

• 28x + 36

• -28x + 36

• -28x - 36

• 28x - 36

• (-oo, 3]

• [3, oo)

• (-oo. 3)

• (-00, -3]

Evaluate:

 $\left(f+g\right)\left(2\right)$  

f(x)=3x+5

g(x)= x²

g(x)-f(x)

• x²-3x-5

• x²-3x+5

• x²-5x-3

• i don't want to play this game

Which is equivalent to    $\left(f\cdot g\right)\left(x\right)\$  

•  $f\left(x\right)\cdot g\left(x\right)$  

•  $x\left(f\right)\cdot x\left(g\right)$  

•  $\left(f\cdot g\right)\cdot x$  

•  $x\cdot y$  

Given f(x) = 2x + 7 and
g(x) = 3x - 2   
Find f(x) ⋅ g(x)

• 6x² +17x -14
• 6x² +6x -9
• 5x + 5
• 6x² -14

• -2
• undefined
• 0
• 1

Given $f(x)=3x^2+7x$  and  $g(x)=2x^2-x-1$  

Find  $(f-g)(x).$  

•  $x^2+8x+1$  
  

•  $x^2+6x-1$  
  

•  $x^2+6x+1$  
  

•  $x^2+8x-1$