Question

1. evaluate the expression -3x - 5 when

a) x = -10 \t\tb) x = -5 \t\tc) x = 5 \t\td) x = 10

Explanation:

Part (a)

Step1: Substitute \( x = -10 \) into \( -3x - 5 \)

\( -3(-10) - 5 \)

Step2: Calculate multiplication first

\( 30 - 5 \)

Step3: Calculate subtraction

\( 25 \)

Step1: Substitute \( x = -5 \) into \( -3x - 5 \)

\( -3(-5) - 5 \)

Step2: Calculate multiplication first

\( 15 - 5 \)

Step3: Calculate subtraction

\( 10 \)

Step1: Substitute \( x = 5 \) into \( -3x - 5 \)

\( -3(5) - 5 \)

Step2: Calculate multiplication first

\( -15 - 5 \)

Step3: Calculate subtraction

\( -20 \)

Answer:

25

Part (b)