Question

how would you solve this?

(8+√5)(8-√5)

Answer 1

\(\large\color{blue}{ \bf C~o~n~j~u~n~g~a~t~e~s}\)

Answer 2

Expand the brackets.
\((a+b)(a-b)\) You need to multiply each of the terms in the first bracket with each of the terms in the second.
\((\color{red} a+b)(\color{red}a -b ) => a^2\)
\((\color{red} a+b)(a \color{red}{-b} ) => -ab\)
\(( a+\color{blue}b)(\color{blue}a -b ) => ab\)
\(( a+\color{blue}b)(a \color{blue}{-b} ) => b^2\)
Now you add them all together.
\(a^2-ab + ab + b^2=?\)