Question

Factor completely 49x*2 − 81.

Answer 1

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

Answer 2

Try , since both coefficients are squares, and a minus sign.....(

( a + b) * ( a - b)

Answer 3

@pooja195 that setup is much more easier.

Answer 4

What set up?

Answer 5

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

Answer 6

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

Answer 7

is it (7-9)*2

Answer 8

I think that is what it looks like, if you have perfect squares a and b

\[a^2*x^2 - b^2 = (a+b)*(a-b\]

Answer 9

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

Answer 10

distribute backwards and check, it works out both ways

Answer 11

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