Evaluate Using the Given Value ab-0.5b when a=1 and b=5

$a b - 0.5 b$ when $a = 1$ and $b = 5$

Step 1

Replace the variable $a$ with $1$ in the expression.

$(1) \cdot b - 0.5 b$

Step 2

Replace the variable $b$ with $5$ in the expression.

$(1) \cdot (5) - 0.5 \cdot 5$

Step 3

Simplify each term.

Multiply $5$ by $1$ .

$5 - 0.5 \cdot 5$

Multiply $- 0.5$ by $5$ .

$5 - 2.5$

Step 4

Subtract $2.5$ from $5$ .

$2.5$