Question

Find the product of (5-√7) and (5+√7)

Answer 1

We are to evaluate the expression:

`(5-√(7))(5+√(7))`

First, we write it in the form below:

`5(5+√(7))-√(7)(5+√(7))`

Next. we open the brackets

`\begin{gathered} =25+5√(7)-5√(7)-(√(7))^2 \\ =25-7 \\ =18 \end{gathered}`

Therefore, the product of the two terms is 18.