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Select the correct answer. Which expression is equivalent to this polynomial? 9x^2 - 4
A. (3x + 2i)(3x - 21)
B. (3x - 2)(3x - 2)
C (3x + 2i)2
D. (3x + 2)2​

Respuesta :

Step-by-step explanation:

Given expression is :

[tex]9x^2-4[/tex]

We can write it as :

[tex](3x)^2-2^2[/tex]

Now using identity : [tex]a^2-b^2=(a-b)(a+b)[/tex]

Here, a = 3x and b = 2

So,

[tex](3x)^2-2^2=(3x-2)(3x+2)[/tex]

Hence, the given expression is equivalent to (3x - 2)(3x + 2) .