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Math help 

http://prntscr.com/kylokt

 Sep 25, 2018
 #1
avatar+111329 
+3

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

 

 

cool cool cool

 Sep 25, 2018

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