[Video] Q5: If f(x) = x^2 -6x +3 / x-1, what is f(-1) ?

Explanation for Question 5 From the Math (No Calc) Section on the Official Sat Practice Test 7

Question five says if F of X is equal to X squared, 2 minus six X plus three divided by X minus one. 3 What is F of negative one? So whenever you're asked, 4 what F of a number is, 5 that's just asking you to take the number in the parentheses and plug that 6 in for ax in your original equation. So all we have to do here 7 is plug in negative one for X. 8 So that's what I'm going to start by doing over negative 9 one plus negative one negative one squared 10 is just one plus negative six times. 11 Negative one is positive six plus three, 12 over negative two. 13 If you add together the top, that becomes 10 over negative two. 14 And finally that simplifies to negative five. 15 So we know that the correct answer here is answer to.