Question

Question 8(Multiple Choice Worth 1 points)

Answer 1

Answer:

(X + 9)(x -9)

Step-by-step explanation:

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Answer 2

Answer:

(X + 9)(x -9)

Step-by-step explanation:

Subtraction of perfect squares:

The factors of a subtraction of perfect squares is given by:

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

What are the factors of x² - 81?

This can be written as:

$x^2 - 81 = (x)^2 - (9)^2$

So

$(x)^2 - (9)^2 = (x - 9)(x+9)$