Question

$if \: a = { \binom{1 \: \: \: -1}{2 \: \: \: \: - 1 } }{ } then \: find \: a {}^{2}$
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Answer 1

Given :

$|1 \: \: \: - 1 | \\ |2 \: \: \: - 1 |$

To find :

a²

Solution :

First we find the value of a

$|1 \: \: \: - 1 | \\ |2 \: \: \: - 1 |$

$(1 \times - 1) - (2 \times - 1) \\ - 1 + 2 \\ 1 \\ a = 1$

The value if a is 1

Now we find the value of a²

$a = 1 \: \: \: \\ a {}^{2} = 1 {}^{2} \\ a {}^{2} = 1 \:$

The value of a² = 1