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sveta [45]
3 years ago
13

Find the product: (x+9)(x-9) a 18 b. -81 C. - 18 d. x-64

Mathematics
2 answers:
Lilit [14]3 years ago
5 0

Answer:

x^2 -81

Step-by-step explanation:

(x+9)(x-9)

FOIL

first x*x = x^2

outer -9x

inner 9x

last -9*9 = -81

Add them together

x^2 -9x+9x -81

Combine like terms

x^2 -81

olga nikolaevna [1]3 years ago
4 0

Answer: B

Step-by-step explanation:

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

Evaluate the power (9^2).

x^2 - 81

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