Question

Factor 64 - x2.
(8 - x)(8 - x)
(8 + x)(8 - x)
(x + 8)(x - 8)

Answer 1

I think we've done one or two of these before. Difference of squares. Put it into terms \((a^2-b^2)\) and then factor it into \((a+b)(a-b)\).

@Palmo4ka, just giving the answer without an explanation is against the Code of Conduct, please don't do that.

Answer 2

Does the first one fit the difference of squares formula? Try multiplying it back out and see if you get what you started with.

Answer 3

it is the one in the middle, try and multiply each of the choices, the one that works out is the one in the middle.

Answer 4

If you factor x^2-64 its
(x-8)(x+8)

Answer 5

@nbouscal gives the general form of a difference of squares come in

Answer 6

The bottom one is not the correct answer. dcolley was giving you an example. You need to work the problem out.