Question

determine o valor de x tal que det A - det B= 0, A= [x 2] e B= [2x x]
x+2 3 3 4

Answer 1

Resposta:

A= [x     2] e B= [2x x]

    [x+2  3]         [3  4]

det(A)=3x-2x-4 =x-4

det(B)=8x-3x=5x

x-4-(5x)=0

-4x=4

x=-1