Factor completely. 49x2 - 9

Question

luigi0210 · Answer

Welcome to openstudy :)
Do you know this is the difference of perfect squares case?

anonymous · Answer

(x+3/7)(x-3/7)

luigi0210 · Answer

Stop giving away wrong answers.. even if it is the wrong one.

anonymous · Answer

That is the wrong answer, the only way for her to do it is to multiply 49 times 9 which is 441 then take the square root of that which is 21 so it would be (x+21)(x-21) and since she would multiply she would have to divide what she mulitplied by and 21/49 is 3/7 which is (x+3/7) times (x-3/7)

anonymous · Answer

and if your going to help someone give them the answer thenshow them how to do it its 11 a.m no one wants to go back and forth with questions. Clearly they dont know how to do squares if they couldn't do the problem they need help.

luigi0210 · Answer

Ha, uh.. no. There's this thing called the Code of Conduct that you follow. Have you read it? It might help you from getting banned from the site.

And your answer is still wrong.

anonymous · Answer

well she can decide whos wrong or right .

luigi0210 · Answer

Well let's see, if we factor what you gave we get this:
$$x^2-\frac{9}{49}$$

luigi0210 · Answer

*distribute 
not factor

kenljw · Answer

49x2 - 9
(7x)^2 - 3^2
(7x + 3) (7x-3)
49 (x + 7/3) (x - 3/7)

kenljw · Answer

49 (x +3/7) (x - 3/7)

luigi0210 · Answer

You guys make everything so complicated.

kenljw · Answer

The 49 out side of quadratic is significant

luigi0210 · Answer

Wouldn't it just be easier to say: (7x-3)(7x+3)? -_-

kenljw · Answer

you could but usually  I make x coefficient 1, much easier to solve

kenljw · Answer

esp. in programing

campbell_st · Answer

why not just make it easy since it is the difference of 2 squares... 

$$(7x - 3)(7x + 3) =49x^2 - 9$$

campbell_st · Answer

it problem is more about identifying perfect squares than anything else.