Question

15/23 Marks

y
10-
600
A B C
a) Complete the table of values for
y = 2x2 + x
9
Х
-2
-1
o
1
2
8
7 구
y
3
6
5-
b) Which of the three curves drawn
matches the graph of y = 2x2 + x?
3-
Overview
Drawing Quadratic Graphs
View One Minute Version

Answer 1

Answer: a) 6, 0, 10 b) yellow/orange line

Explanation:

a) Plug the x in the y functions, y = 2x² + x

when x = -2, y = 2(-2)² + (-2) = 8 - 2 = 6

when x = 0, y = 2(0)² + (0) = 0 + 0 = 0

when x = 2, y = 2(2)² + (2) = 8 + 2 = 10

b) By looking the table, the equation has a point (0,0), only blue and yellow/orange line has the passed the point (0,0), so we delete the red line option.

And we choose a point (1,3), then only yellow/orange line has passed the point (1,3). So the yellow/orange line fits the equation.