is #12 D?
is #15 B?
12. Which function is a quadratic function?
A. y=3x^2+x
B. y=2x-1
C. y=3/x
D. y= -|x|
Which function rule represents the data in the table?
x -3, -2, -1, 0, 1
y 1, -2, -5, -8, -11
A. y=-3x-8
B. y=1/3x -8
C. y=1/3x+8
D. y=3x+8
2 answers
a quadratic has x^2 as its highest power. So, A.
Note that y decreases by 3 when x increases by 1. So, it will look like
y = -3x
But, when x=0, -3x=0, and y is -8. So,
y = -3x-8
again, A
Note that y decreases by 3 when x increases by 1. So, it will look like
y = -3x
But, when x=0, -3x=0, and y is -8. So,
y = -3x-8
again, A