+128460 We can solve the first with the mid-point formula
The x coordinate of the other unknown point can be found as
(2 + x) / 2 = -1 multiply both sides by 2
2 + x = -2 subtract 2 from both sides
x = -4
Since only one answer has -4 as the x coordinate, the answer must be (-4, -2) ⇒ "H"
For the second x^3 - 64 factors as a difference of cubes =
(x - 4) (x^2 + 4x + 16)
So (x - 4) is a factor and "A" must be correct
