Which of the following is a factor of 64x3 plus 343?

Answer 1

There are no real solutions to this equation. Applying the quadratic formula, we find two imaginary solutions.

x = 2.315032397181517i
x = -2.315032397181517i
where i is the square root of negative one.

If that were 64x3, it would have been (4x + 7)(16x2 - 28x + 49)

Answer 2

This would have been easier to answer if you had told us what the following choices were, but if they include (4x + 7) or (16x2 - 28x + 49), choose one of them.

Answer 3

64X - 8

8(8X - 1)
==========simplest factoring here

Answer 4

You can't, unless you are willing to use imaginary numbers.

mm + 64 = ( m + 8i ) * ( m - 8i )

Answer 5

(8x - 11)(8x + 11)