Answer :
Which of the following equations represents a parabola that opens down and has a vertex at (3,-1)? O
A. y = -2(x - 3)2 - 1
B. y=-2(x+3)^2 - 1
C. y = 2(x - 3) ^2 - 1
D. y = -2(x - 3)^22 +1
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The standard parabola function is
f (x) = a x2 + bx + c
The vetex form parabola function is
f(x) = a ( x – h ) 2 + k
The vertex is (h, k ).
A. y = -2(x - 3)2 - 1 vertex (3, -1) opens down
B. y=-2(x+3)^2 - 1 vertex (-3, -1) opens down
C. y = 2(x - 3) ^2 - 1 vertex (3, -1 ) opens upward
D. y = -2(x - 3)^2 +1 vertex (3, 1) opens down
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The parabola that opens down and has a vertex at (3,-1) is A. y = -2(x - 3)2 - 1
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