Los op vir x en kies die regte antwoord as \( \left( {x - 3} \right)\left( {x + 5} \right) = 9 \)

\( \begin{align} \left( {x - 3} \right)\left( {x + 5} \right)& = 9\\ {x^2} + 2x - 15& = 9\\ {x^2} + 2x - 24 &= 0\\ \left( {x + 6} \right)\left( {x - 4} \right) &= 0\\ x = - 6\,\,\,of\,\,\,x &= 4 \end{align} \)