Question

If $a=(-1)andb=3$, find the value of: $(a+3b)÷8a$

Answer 1

Given expression $(a+3b)÷8a$ and $a=(-1)andb=3$

We will put the value of $a$ and $b$ in given expression:

$$\begin{gathered} \left[(-1)+3\left(3\right)\right]÷8(-1)=\left[-1+9\right]÷8(-1) \\ (a+3b)÷8a=8÷-8 \\ =\frac{8}{-8}=-1 \end{gathered}$$

Hence $-1$, is the required value of expression.