## anonymous one year ago Factor completely 49x*2 − 81.

1. pooja195

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

2. DanJS

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

3. anonymous

@pooja195 that setup is much more easier.

4. pooja195

What set up?

5. anonymous

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

6. pooja195

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

7. anonymous

is it (7-9)*2

8. DanJS

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

9. DanJS

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

10. DanJS

distribute backwards and check, it works out both ways

11. pooja195

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