Question

(1) (a +2)(a - 1) expand
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Answer 1

Step-by-step explanation:

(a+2)(a-1)

=a²+2a-a-2

=a²+a-2

Answer 2

Answer:

Let us simplify the expression, we get

(a + 2) (a – 1) = a2 + [(2) + (-1)] a + [(2) × (-1)]

By using the logic,

(x + p) (x + q) = x2 + (p + q)x +(p × q)

Here, x = a, p = 2, q = -1

Now, substitute the value we get

= a2 + (2 – 1)a + (-2)

= a2 + 2a – a – 2

= a2 + a – 2

∴ (a + 2) (a – 1) = a2 + a – 2