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Quadratic Function
Test Description: Quadratic function
Instructions: Answer all questions to get your test result.
1) A parabola graph which opens downward is classified as
A
concave down
B
concave left
C
concave right
D
concave up
2) Axis of symmetry in form of vertical line separates parabola into
A
five equal halves
B
three equal halves
C
two equal halves
D
four equal halves
3) The function y=3x² -12x has
A
a maximum value of -12
B
a maximum value of -2
C
a minimum value of -12
D
a minimum value of 2
4) If the roots of an equation are -2 and 4, then the discriminant is:
A
a positive number
B
an imaginary number
C
0
D
a negative number
5) For the function y=a x² + bx + c, the y-intercept is always:
A
c
B
-b/2a
C
c/a
D
4ac-b²
6) If roots of x² - 5x + a = 0 are equal, then a
A
25/4
B
-25/4
C
25/5
D
-25/5
7) For a quadratic equation a x² + bx + c sum of root is
A
-b/a
B
none of the above
C
b/a
D
c/a
8) Quadratic equation whose roots are α, β is
A
x² + (α + β)x + αβ = 0
B
x² - (α + β)x + αβ = 0
C
x² + (α + β)x - αβ = 0
D
x² - (α + β)x - αβ = 0
9) Which of the following sequences could be generated by a quadratic function?
A
-5, -3, 3, 13, …
B
2, 6, 18, 54, …
C
2, 4, 8, 12, …
D
1, 2, 3, 4, …
10) The graph of the equation y=( x+7)² + 4 is the image of y= x² after:
A
a horizontal translation of -7 and a vertical translation of - 4
B
a horizontal translation of 7 and a vertical translation of -4
C
a horizontal translation of 7 and a vertical translation of 4
D
a horizontal translation of -7 and a vertical translation of 4
*select an answer for all questions
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