SAT Question of The Day June 27th 2013
In the quadratic equation above, is a constant. The graph of the equation in the contains the points and. What is the value of ?
Well – this is a nice question as you are actually given too much information.
We have the equation that correlates between X values and Y values.
This relation is quadratic. We are missing the value of a number that is replaced by the letter C.
It is clear that if the relation between X and Y is true then C must assumes a certain value.
The graph of the equation passes through 6,0 that implies that when X=6 Y=0
0=6^2-4*6+C or 0=36-24+C
That in turn means C=-12
You could have come to the same conclusion using the other point – however – if you don’t like to work hard try to avoid negative numbers.
52% out of 143,000 got it right.