I just published my video playlist that explains all of the math questions in the 2018 PSAT Alternate test that was conducted on the 24th of October: **2018 PSAT Alternate Test Video Explanations**.

## 2018 PSAT Wednesday Test: Video explanations

Here is the link to the playlist of videos that explain all of the math questions in the 2018 PSAT Wednesday test that was conducted on the 10th of October: **2018 PSAT Wednesday Test Video Explanations**.

## SAT math practice question: Properties of parabolas

Try the following SAT math question (No Calculator) that tests your understanding of the graph of parabolas in the coordinate plane.

$$ y = (x-r)(x-s)$$

The equation above represents the graph of a parabola in the $xy-$plane, where $r$ and $s$ are constants, and $r \neq s$. Which of the following represents the $x-$coordinate of the vertex of the parabola?

- $\quad \dfrac{r-s}{2}$
- $\quad \dfrac{r+s}{2}$
- $\quad r-s$
- $\quad r+s$

## 2018 October SAT Test: Video explanations

Here is the link to the playlist of videos that explain all of the math questions in the 2018 October SAT Question and Answer Service test. The playlists are separated by sections. Section 3 of the math section does not the allow use of calculator, whereas the calculator is permitted in Section 4 of the math section.

## SAT math practice question: Functions and factors

Try the following SAT math question (No Calculator) that tests your understanding of x-intercepts and factors of a polynomial function.

In the $xy$-coordinate plane, the three $x$-intercepts of the graph of the polynomial function $p$ are $-1, 0,$ and $2$. Which of the following is NOT a factor of $p$?

- $\quad x^2-1$
- $\quad x^2+x$
- $\quad x^2-2x$
- $\quad x^2-x-2$

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