If A = | 4 2 | and det(A) = 0, what is the value of x?
| x 3 |

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Question

If A = | 4  2 | and det(A) = 0, what is the value of x?
        | x  3 |

Accepted Answer

6 — Award 1 mark for using det(A) = ad − bc = 0, giving (4)(3) − (2)(x) = 0, so 12 − 2x = 0, x = 6. B is incorrect — this is the value of 4 × 3. C is incorrect — this confuses 12 ÷ 6 with the correct calculation. D is incorrect — this results from adding instead of subtracting in the determinant formula.

Answer

6

Answer

8

Answer

2

Answer

12

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