Question

Multiply -x – 2
by
-x^2 + 4x – 2

Answer 1

\(\Large \color{purple}{\rightarrow (-x - 2)(-x^2 + 4x - 2) }\)

\(\Large \color{purple}{\rightarrow -x(-x^2 + 4x - 2) - 2(-x^2 + 4x - 2) }\)

Answer 2

\(\Large \color{purple}{\rightarrow x^3 - 4x^2 + 2x + 2x^2 - 8x + 4 }\)

Answer 3

\(\Large \color{purple}{\rightarrow x^3 - 2x^2 - 6x + 4 }\)

Answer 4

wasn't sure if i did it right but i do have the same answer. i did it a longer way. thanks

Answer 5

Then you are correct, my friend.

Answer 6

\[\begin{align}

&&&-x-2\\
&\times&\color{green}{-x^2}&\color{red}{+4x}\color{blue}{-2}\\ \hline \\
&&&\color{blue}{+2x+4}\\
&&\color{red}{-4x^2}&\color{red}{-8x}\\
&+&\color{green}{x^3+2x^2}\\ \hline \\
&&x^3-2x^2&-6x+4

\end{align}\]

Answer 7

@nbouscal How did you make that line?

Answer 8

If you right-click my comment you should be able to select Show Math As TeX Commands and see everything I did

Answer 9

his looks like the one in the books.

Answer 10

@nbouscal I know but my browser doesn't support that.

Answer 11

Oh, that sucks Parth, you should get Chrome. If you're asking about the horizontal line, it's just \hline, but I think you have to be within an {align} environment to use it.

Answer 12

I have Chrome lol

Answer 13

Oh, weird. It works on my Chrome.

Answer 14

\hline doesn't work

Answer 15

You have to have it between \begin {align} and \end {align} (no spaces)

Answer 16

\[ \begin{align}
Like \ this \ =)\\
\hline

\end{align} \]

Answer 17

I couldn't make it wide though

Answer 18

The line is as wide as the environment. You need to put in some filler to make the environment wider. \begin{align}
\text{Add some filler text here.} \\ \hline \\
\end{align}

Answer 19

BTW, Parth, there is a \(\LaTeX\) Practice study group on this site.

Answer 20

\(\begin{align} \hline \text{I like it.} \end{align}\)

Answer 21

I know, I'm a part of it.