Question

date:
expressions
expression 5x - 20 when
b) x = -3
c) x = 16
d) x = -16
e) x = -125

Explanation:

To solve the expression \(5x - 20\) for different values of \(x\), we substitute the given \(x\)-values into the expression and simplify. Let's solve for each part:

Part b) \(x = -3\)

Step 1: Substitute \(x = -3\) into the expression

\(5(-3) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-3) = -15\). Then, subtract 20: \(-15 - 20 = -35\)

Part c) \(x = 16\)

Step 1: Substitute \(x = 16\) into the expression

\(5(16) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(16) = 80\). Then, subtract 20: \(80 - 20 = 60\)

Part d) \(x = -16\)

Step 1: Substitute \(x = -16\) into the expression

\(5(-16) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-16) = -80\). Then, subtract 20: \(-80 - 20 = -100\)

Part e) \(x = -125\)

Step 1: Substitute \(x = -125\) into the expression

\(5(-125) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-125) = -625\). Then, subtract 20: \(-625 - 20 = -645\)

Final Answers:

• b) \(\boldsymbol{-35}\)
• c) \(\boldsymbol{60}\)
• d) \(\boldsymbol{-100}\)
• e) \(\boldsymbol{-645}\)

Answer:

To solve the expression \(5x - 20\) for different values of \(x\), we substitute the given \(x\)-values into the expression and simplify. Let's solve for each part:

Part b) \(x = -3\)

Step 1: Substitute \(x = -3\) into the expression

\(5(-3) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-3) = -15\). Then, subtract 20: \(-15 - 20 = -35\)

Part c) \(x = 16\)

Step 1: Substitute \(x = 16\) into the expression

\(5(16) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(16) = 80\). Then, subtract 20: \(80 - 20 = 60\)

Part d) \(x = -16\)

Step 1: Substitute \(x = -16\) into the expression

\(5(-16) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-16) = -80\). Then, subtract 20: \(-80 - 20 = -100\)

Part e) \(x = -125\)

Step 1: Substitute \(x = -125\) into the expression

\(5(-125) - 20\)

Step 2: Simplify the multiplication and subtraction

First, calculate \(5(-125) = -625\). Then, subtract 20: \(-625 - 20 = -645\)

Final Answers:

• b) \(\boldsymbol{-35}\)
• c) \(\boldsymbol{60}\)
• d) \(\boldsymbol{-100}\)
• e) \(\boldsymbol{-645}\)