Given matrix A below, calculate det[A] twice using minors and cofactors [tex]A = \left[\begin{array}{ccc}1&2&3\\3&4&

Question

Given matrix A below, calculate det[A] twice using minors and cofactors

A = \left[\begin{array}{ccc}1&2&3\\3&4&5\\6&7&8\end{array}\right]

Pivot on:
a) row 2, and also
b) column 3

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Thu Hương 4 years 2021-09-05T12:40:10+00:00 1 Answers 13 views 0

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    2021-09-05T12:41:50+00:00
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    Answer:

    a. 3(16-21) – 4(8-18) +5(7-12) = -15 + 40 – 25 = 0

    b. 3(21-24) – 5(7-12) + 8(4-6) = -9 + 25 – 16 = 0

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )