Question

Evaluate and simplify the expression when A=4 and b=- 1

Answer 1

Since the given expression is

$\frac{5-2(a+3b)}{2}$

Since a = 4 and b = -1

Substitute them in the expression above

$\begin{gathered} \frac{5-2(a+3b)}{2}=\frac{5-2(4+3\lbrack-1\rbrack)}{2} \\ =\frac{5-2(4+\lbrack-3\rbrack)}{2} \end{gathered}$

Simplify the bracket

$\begin{gathered} \frac{5-2(4-3)}{2}=\frac{5-2(1)}{2} \\ =\frac{5-2}{2} \end{gathered}$

Simplify the numerator

$\frac{5-2}{2}=\frac{3}{2}$

The missing is 3