Explanation for Question 28 From the Math (Calc) Section on the 2017 May Sat
Question 28 gives us first a graph and then a chart. 2 And it says the graph of the function F is shown on the X, 3 Y plane above and selected values for the function G are shown in the 4 table, for which of the following values of X is GFX greater than 5 F effects. So what we need to understand here is what our 6 X values are and what are G of X and F of X are 7 in the graph that X value is going to be literally 8 just like the value on where you are on the X axis. 9 And then in the chart, it's just going to be the X 10 side of the chart that present a little easier. 11 Let's talk about our GFX in our FX or G of X, 12 which is the chart. Each value is going to be 13 the one on the left side. 14 So let me use a different color, sorry, on the right side. 15 Um, it's going to be the ones here, 16 but you're going to want to think about when do we have each G 17 of X value and that's at a certain X. 18 So if they tell you like X is negative one you're G of X 19 is negative two. And so on. 20 Now, similar thing with the graph, your F of X value is the Y 21 coordinate of your graph right there of your upside down parabola. 22 Um, so when they give you X equals zero, 23 your value is going to be F of X equals three and so on. 24 So now it goes through the answer choices. 25 And we see when G of X is greater than F of X. 26 Take a note. They're giving us the X value of not the G or 27 that not that you have X or F of X, just the X. 28 So for a, when X equals zero after 29 effects, w...