Question

(2a - 9) (2a + 9) Simplify using appropriate identity.
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Answer 1

Answer:

Here is your answer...

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Answer 2

Answer:

4a^2-81 is the correct answer

Step-by-step explanation:

Here,

(2a-9)(2a+9)

We have the identity of (a+b)(a-b)=a^2-b^2

thus, it will be

(2a)^2-(9)^2

=4a^2-81

Hope it will helps you