Question

CL 2-110. Evaluate the expressions below for the given values. (LT 2) a. -3x + 4x + 5 for x = -2 b. 6- (5x - 9) for x = 1 2m e for k=-8 d. n-1 -m'-n for m = -2, n = 3

Answer 1

To evaluate an expression we have to plugg in the value that is given. Think of the first one

`-3x+4x+5`

Since the value of x is -2, we substitute the value in the expression

`\begin{gathered} -3(-2)+4(-2)+5=6-8+5 \\ =3 \end{gathered}`

So the first expression has a value of 3 when x=-2.

For the second one we have the expression

`6-(5x-9)`

For x=1, we have

`\begin{gathered} 6-(5(1)-9)=6-(5-9) \\ =6-(-4) \\ =6+4 \\ =10 \end{gathered}`

So the second expression has a value of 10 when x=1.

For the last one we have

`n-1-m-n`

where m=-2 and n=3. Then

`\begin{gathered} 3-1-(-2)-3=3-1+2-3 \\ =1 \end{gathered}`

So the last expression has the value of 1 when m=-2 and n=3.