My question is on here : SparkNotes: SAT Subject Test: Math Level 2: Review Questions
#5. I don't get why and I don't get its explanations
Sorry for just pasting the website, I cannot copy the diagram. Thanks in advance!!
My question is on here : SparkNotes: SAT Subject Test: Math Level 2: Review Questions
#5. I don't get why and I don't get its explanations
Sorry for just pasting the website, I cannot copy the diagram. Thanks in advance!!
Hello, fabxx!
I don't get its explanations either . . .
5. A portion of the graph of is shown.Code:| * | * * * * * | * * *| * - - - -*- - -*-+- - -*- - - - - * - - - * | * * | * |
Which of the following could be ?
Note that the graph has four x-intercepts, two positive and two negative.
One of the x-intercepts is 0; this graph would contain the origin..No
This quartic opens down..No
This is a cubic function..No
To find the x-intercepts: ..No
Quadratic Formula: .
It can be shown that the right side is either negative or zero.
. . If it is negative, there are no real values of
. . If it is zero, there is only one x-intercept.
.Yes
To find the x-intercepts: .
Quadratic Formula: .
If is negative, the right side is positive.
Hence, for , there are four x-intercepts:
. .
But the function in B is an even function while the graph is not that of an even function. So as written there is no answer.
Look at question #6. The given graph is not an odd function either.
That is just a poor set of problems and they are selling them as SAT review.