Explanation for Question 32 From the Math (Calc) Section on the Official Sat Practice Test 8
So in question number 32, we're asked to solve for the value of a, 2 and we're told that X is equal to one. So let's go ahead and 3 rewrite this equation with the new information that we just got from this question. 4 So instead of XL, right one, so it's one minus one half I want 5 to write one half a day is equal to zero. 6 Now, if I want to sell for a, the first thing I need to 7 do is get rid of this one. And I can do that by subtracting 8 one from both sides. So these are canceled and left with negative one half 9 is equal to negative one. Now to get rid of that negative one half, 10 I'll start by just multiplying both sides by negative one. 11 Perhaps it's easier to get rid of the negative first, 12 right? So this, these two negatives will cancel. 13 I'll be left with one, half a is equal to positive one 14 because negative one times negative one is just positive one. 15 Now I can get rid of this one half to get rid of a 16 two in the denominator. I need to put a two in the numerator, 17 which is like multiplying by two. So multiply by two on both sides. 18 These students will cancel. I'll be left with a, 19 is equal to two. So our answer is two.