which of the following is equal to (a+1)(a-1)?
(a+1)²
(a-1)²
a²-b²
a²-1
Answers
Answered by
1
Answer:
d)a2-1
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Answered by
2
a² - 1.
When we open the brackets, we get :
(a+1)(a-1)
= a² - a + a - 1
= a² - 1
{ -a + a = 0 }
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