Question

Explain What mistake Richard made and how he can fix it

Answer 1

Step 5

Explanation:

Given the equation:

`x^2-6x-8=0`

On examining Richard's solution, the mistake Richard made is shown below:

In the second part of step 5 indicated above, the square root of 4 was erroneously written as 2i.

The error is fixed below:

`\begin{gathered} \text{Step 5: }x=(6+2)/(2)\text{ and }x=(6-2)/(2) \\ \text{Step 6: }x=4\text{ and }x=2 \end{gathered}`