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avatar+152 

What is the expression in factored form?

 

9x^2 – 4 

 Nov 30, 2018
 #1
avatar+103148 
+2

9x^2  - 4

 

We have a difference of squares.....so......

 

a^2 - b^2 =  (a + b) (a - b)

 

Let   a^2  = 9x^2   so....a = 3x

Let b^2 = 4  so......b = 2

 

So we have

 

9x^2 - 4  =   (3x + 2) (3x - 2)

 

 

cool cool cool

 Nov 30, 2018
 #2
avatar+805 
+2

We see a difference of squares! \(\sqrt9=3, \sqrt4=2\) so...

\((3x+2)(3x-2)\).

 

You are very welcome!

:P

 Nov 30, 2018

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