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Dmitry_Shevchenko [17]
3 years ago
8

The expression 25x2 - 81 can be rewritten as (5x - 9)(5x + 9). (5x - 9) is a ____ of 25x2 - 81.

Advanced Placement (AP)
2 answers:
Alisiya [41]3 years ago
8 0

Answer: factors.

Explanation: The expression: 25x^2 - 81 is a quadratic equation, so it has two x-axis intercepts.

Now, it can be written as  (5x - 9)(5x + 9) = 5(x - 9/5)(x + 9/5)

where -9/5 and 9/5 are the two x-axis intercepts of the quadratic equation.

Now, the equation (5x - 9)(5x + 9) is called a "factorization" of the equation  25x^2 - 81, and the segments  (5x - 9) and (5x + 9) are called "factors" of the equation 25x2 - 81.

Rama09 [41]3 years ago
5 0
It's a factor of 25x2-81
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