Mathematics 9 (Complete Solutions)
Q1
Find the determinant of the following matrices.
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Solution:
| A | = |
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| ∣ A ∣ | = |
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| ∣ A ∣ | = | (-1)(0) - (1)(2) |
∣ A ∣ = 0 - 2
∣ A ∣ = -2 Answer
| B | = |
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| ∣ B ∣ | = |
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| ∣ B ∣ | = | (1)(-2) - (3)(2) |
∣ B ∣ = -2 - 6
∣ B ∣ = 8 Answer
| C | = |
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| ∣ C ∣ | = |
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| ∣ C ∣ | = | (3)(2) - (2)(3) |
∣ C ∣ = 6 - 6
∣ C ∣ = 0 Answer
| D | = |
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| ∣ D ∣ | = |
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| ∣ D ∣ | = | (3)(4) - (2)(1) |
∣ D ∣ = 12 - 2
∣ D ∣ = 10 Answer