Factor completely 49x*2 − 81.

Question

pooja195 · Answer

Diffrence of squares 
 $$\huge~\rm~\sqrt{49x^2}-\sqrt{81}$$

danjs · Answer

Try , since both coefficients are squares, and a minus sign.....(

( a + b) * ( a - b)

anonymous · Answer

@pooja195 that setup is much more easier.

pooja195 · Answer

What set up?

anonymous · Answer

When you square root the numbers instead of trying to factor them. Some people don't think of square rooting the numbers.

pooja195 · Answer

Right :) thanks ^-^ @DanJS 's work is helpful too since it belongs in that form :)

anonymous · Answer

is it (7-9)*2

danjs · Answer

I think that is what it looks like, if you have perfect squares a and b

$$a^2*x^2 - b^2 = (a+b)*(a-b$$

danjs · Answer

sorry  (ax - b)*(ax+b)

danjs · Answer

distribute backwards and check, it works out both ways

pooja195 · Answer

No rember the x's...u have it some what correct 
(7x+9) (7x-9) 
We need a positive and a negative statement