Se considera matricea A = [tex] \left[\begin{array}{ccc}1&2\\2&4\\\end{array}\right] [/tex] si I₂=[tex] \left[\begin{array}{ccc}1&0\\0&1\\\end{array}\right] [/tex] .
Determinati nr reale x si y pt care A + [tex] \left[\begin{array}{ccc}x&y\\y&-3\\\end{array}\right] [/tex] = I₂ .