Hello Everyone! Please help Me!

\(\displaystyle \mbox{If }\, \left[\,\begin{array}{cc}a\, +\, b&2\\5&ab\end{array}\,\right]\, =\, \left[\,\begin{array}{cc}6&2\\5&8\end{array}\,\right],\, \mbox{ find the value of }\, a\, \mbox{ and }\, b.\)

So, we have

By equality of matrices:

a+b=6 ...(i)

ab = 8 ...(ii)

I know the answer is a=2, b=4 or a=4, b=2. But i don't know the process of finding it.

\(\displaystyle \mbox{If }\, \left[\,\begin{array}{cc}a\, +\, b&2\\5&ab\end{array}\,\right]\, =\, \left[\,\begin{array}{cc}6&2\\5&8\end{array}\,\right],\, \mbox{ find the value of }\, a\, \mbox{ and }\, b.\)

__So far i have done:__So, we have

By equality of matrices:

a+b=6 ...(i)

ab = 8 ...(ii)

I know the answer is a=2, b=4 or a=4, b=2. But i don't know the process of finding it.

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