Question

$a {}^{2} - 23a + 42$
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Answer 1

Answer:

we have

${a}^{2} - 23a + 42 = 0$

Step-by-step explanation:

We can write it as

$(a - 21)(a - 2) = 0$

Implies

$a - 21 = 0 \: \: or \: \: a - 2 = 0$

Implies

$a = 21 \: \: or \: \: a = 2$

Answer 2

Answer:

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