Find x: Determinant Equation 1

[harpazo]

See picture for question and solution.

 

[Deleted member 4993]

See picture for question and solution.

View attachment 13855

Correct but should be written as:

\(\displaystyle x = \pm 1\)

The "sign" should come before the number.

 

[Otis]

When a plus-or-minus sign appears within an equation, it denotes two separate equations.

So, we can also write: \(\;\) x = 1 \(\;\) OR \(\;\) x = -1

If you had chosen to express your answer like that, then I'm thinking you would not have written:

x = 1+ \(\;\) OR \(\;\) x = 1-

 

[harpazo]

Thank you everyone.