Question

expand(a +2)(a - 1)​

Answer 1

Answer:

answer is attached

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

It is known that,

It is known that,(x+a) (x+b) = x2 + (a+b)x + ab

It is known that,(x+a) (x+b) = x2 + (a+b)x + ab(a+2) (a−1)

It is known that,(x+a) (x+b) = x2 + (a+b)x + ab(a+2) (a−1)= (a)2 + {2 + (-1)}a + (2) × (-1)

It is known that,(x+a) (x+b) = x2 + (a+b)x + ab(a+2) (a−1)= (a)2 + {2 + (-1)}a + (2) × (-1)= a2 + (2-1)a-2

It is known that,(x+a) (x+b) = x2 + (a+b)x + ab(a+2) (a−1)= (a)2 + {2 + (-1)}a + (2) × (-1)= a2 + (2-1)a-2= a2 + a - 2