Question

Q.)Expand
$(a + 2) \: (a - 1)$


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Answer 1

Answer:

a²+(2-1)a+2 x -1

a²+a-2

Step-by-step explanation:

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Answer 2

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$= a {}^{2} + a - 2.$

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$(a + 2) \: (a - 1)$

$= a \: (a - 1) + \: (a - 1)$

$= a {}^{2} \: - a \: + 2a - 2$

$= a {}^{2} \: + ( - a + 2a) -$

$2(combining \: like \: terms \: )$

$= a {}^{2} + a - 2$

Hence, (a + 2) ( a - 1 )

$= a {}^{2} \: + a - 2.$

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