Factor the eqeation..

Algebra
Tutor: None Selected Time limit: 1 Day

May 19th, 2015

Hello!

4x^2-9

Okay, so you need to factor it.  Notice how there are only two terms, 4x^2 and 9, and there's no term with just an x.  The two terms are then going to be squares.  We need the terms with just an x to cancel out.  

Square root of 4x^2 is 2x.  Square root of 9 is 3.  

So (2x+3)(2x-3).  To see the other way around, multiply these out, and you can see the middle terms with an x cancel out.

(2x+3)(2x-3) = 4x^2 - 6x + 6x - 9

The blue terms cancel out.

























4x^2 - 9 = (2x+3)(2x-3)

Answer is A.

Let me know if you have any questions.  Please give me a good rating if you get the chance :).

May 19th, 2015

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