Question

If A² + 5A + 3I = 0, |A| ≠ 0, then A^–1 = ______

Options

• `(-1)/3 ("A" + 5"I")`

• `(-1)/5 ("A" + 3"I")`

• (A + 15I)

• `(-1)/3 ("I" + 5"A")`

Answer 1

If A² + 5A + 3I = 0, |A| ≠ 0, then A^–1 = `bbunderline((-1)/3 ("A" + 5"I"))`