Question

O valor de X no determinante

Answer 1

$\boxed{\begin{array}{l}\begin{pmatrix}\sf x&\sf x+2\\\sf5&\sf7\end{pmatrix}=0\\\sf 7x-5x-10=0\\\sf 2x=10\\\sf x=\dfrac{10}{2}\\\sf x=5\end{array}}$