Carcass wrote:
Which points lie on the graph of y=3x2+2x−1 ?
Indicate all possible choices.
A. (−5,−13)
B. (−4,−10)
C. (0,2)
D. (3,1412)
E. (5,1912)
Explanation Key Concept: If a point lies on a given line (or curve), then the x- and y-coordinates of that point must satisfy the equation of that line (or curve) So, for each answer choice, we must plug in the x and y values (aka the coordinates) to see whether they satisfy the given equation.
A.
(−5,−13) We get:
−13=3(−5)2+2(−5)−1=77−6Doesn't work.
ELIMINATE A
B.
(−4,−10) We get:
−10=3(−4)2+2(−4)−1=50−5=−10WORKS!C.
(0,2) We get:
2=3(0)2+2(0)−1=2−1=−2Doesn't work.
ELIMINATE C
D.
(3,1412) We get:
14.5=3(3)2+23−1=292=14.5WORKS!E.
(5,1912)[/quote]
We get:
19.5=3(5)2+25−1=774=19.25Doesn't work.
ELIMINATE E
Answer: B & D
Cheers,
Bret