PLEASE HELP FOR STUDY GUIDE!
What is the equation, in standard form, of a parabola that models the values in the table?
x: -2, 0, 4
f(x): -7, 3, -73
A. y = -3x2 - 4x + 3
B. y = -4x2 - 3x + 3
C. y = -3x2 - 3x + 4
D. y = 4x2 + 3x - 3

Question

PLEASE HELP FOR STUDY GUIDE!
What is the equation, in standard form, of a parabola that models the values in the table?
x:	-2,	0,	4
f(x):	-7,	3,	-73
  A. y = -3x2 - 4x + 3 	
  B. y = -4x2 - 3x + 3 	
  C. y = -3x2 - 3x + 4 	
  D. y = 4x2 + 3x - 3 < NOT CORRECT

anonymous · Answer

anyone? :(

anonymous · Answer

Just take the values from x and plug them into the equation. For instance Lets look at A

If we put -2 in for x it should give us y= -7. Lets see


$ \huge y = -3(-2)^2 - 4(-2) + 3   = -1 $  so y = -1 so this is not correct or our answer.

Do the same thing for B

 $ \huge  y = -4(-2)^2 - 3-(-2) + 3 = -14  $ So we know B is not the right answer because when x = -2 i the f(x) = -7 but B says it = -14. Now that you know that A and B is not the right answer, what one do you think is correct?