Question

3 12 2. I = Given A= = El -a If A - I is a singular matrix then. a) = 0 b) 2-3X -4 = 0 c) x² + 3x -4 = 0 d) x²-3x - 6 = 0​

Answer 1

Answer:

Hey! Hope you're doing good! I tried using the formula section provided here but it wasn't convenient. ^^"

So, the answer is (b)

Step-by-step explanation:

Singular matrices have their determinant zero. I, first, formed the matrix (A - ~I). Then, calculated its determinant, and equated it to zero.

I've even found the values of lambda. But, that's pretty unnecessary because the question ends at the quadratic equation.

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Hope this helps! :D

(Oh, yes! Please excuse my bad handwriting ^^")