Which relationship shows a quadratic variation?
A. x 2 3 4 5
f(x) 1 4 9 16

B. x 1 2 3 4
f(x) 3 6 9 12

C. x 1 2 3 4
f(x) 4 16 34 64

D. x 1 2 3 4
f(x) 4 3 2 1

Which is the quadratic variation equation for the relationship?

y varies directly with x2 and y = 72 when x = 3.

Question

Which relationship shows a quadratic variation?
A.    x   2 3 4  5
      f(x) 1 4 9 16

B.   x    1 2 3  4
      f(x) 3 6 9 12

C.  x   1  2  3   4
    f(x) 4 16 34 64

D.  x 1 2 3 4
   f(x) 4 3 2 1

Which is the quadratic variation equation for the relationship?

y varies directly with x2 and y = 72 when x = 3.

anonymous · Answer

First is A. If you plot the points, you will see that they form a quadratic relationship. 
A possible solution for the second question is f(x)=8x^2