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What are the factors of x2 − 81? (x + 9)(x − 9) (x − 9)(x − 9) (x + 3)(x − 27) Prime

User Mostafa
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2 Answers

6 votes
x^2-81=x^2-9^2=(x+9)(x-9)

this is the answer
User WeirdlyCheezy
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8.6k points
4 votes

Answer: The correct option is (A)
(x+9)(x-9).

Step-by-step explanation: We are given to select the factors of the following quadratic expression :


E=x^2-81~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)

We will be using the following factorization formula :


a^2-b^2=(a+b)(a-b).

From (i), we have


E\\\\=x^2-81\\\\=x^2-9^2\\\\=(x+9)(x-9).

Thus, the factored form of the given expression is
(x+9)(x-9).

Option (A) is CORRECT.

User Topera
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9.6k points

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