Question

A) Complete the table of values for y = x² - 4x

-1 0 1 2
3
4
5
0
-3
X
y 1
Homework Progress
13/35 Marks
4
5
b) Which of the three curves drawn
matches the graph of y = x² - 4x ?
A B
di
2

Answer 1

`\left[\begin{array}{cccccccc}x&-1&0&1&2&3&4&5\\y&5&0&-3&-4&-3&0&5\end{array}\right]`

Graph B is the matching one.

Explanation:

a) For the bottom row of y values, simply fill in the corresponding x value in the equation. E.g., for x=1, you have y = 1² - 4·1 = 1 - 4 = -3 (that one was incorrect in your pic).

b) Keep it simple, check the y value for x=0, it is also 0, so only a graph which passes through (0,0) is the correct one, which is B.