d. Evaluate the product (a-1)(a+1) for a = -2
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Answered by
1
Answer:
3
Step-by-step explanation:
(a-1)(a+1) =a^2 -1
(-2)^2 -1
= 3
Answered by
0
Step-by-step explanation:
by using identity 3 ; (a+b)(a-b)= a²-b²
(a-1)(a+1)= a²-1²
putting a=-2
= (-2)²-1
= 4-1= 3
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