Question

Choose the correct simplification of the expression -5x2(4x - 6x2 - 3). (4 points)

A) 30x4 - 20x3 + 15x2

B) -11x4 - x3 - 8x2

C) -30x4 + 20x3 - 15x2

D) 30x4 + 20x3 + 15x2

Answer 1

@mathmath333 @mrdoldum
Help?

Answer 2

http://openstudy.com/study#/updates/54e4c96ee4b0aba126e828fd

Answer 3

multiply each term inside the parenthesis with \[-5x^2\] and add them

Answer 4

\[a(b+c)=ab+ac\]

Answer 5

So it would be A? :/

Answer 6

\(\large \begin{align} \color{black}{
-5x^2(4x - 6x^2 - 3). \hspace{.33em}\\~\\
=\color{red }{-5x^2\times 4x} - (-5x^2)6x^2 -(-5x^2) 3 \hspace{.33em}\\~\\
}\end{align}\)


\(\large \begin{align} \color{black}{
-5x^2\times 4x \hspace{.33em}\\~\\
=-5\times 4\times x^2\times x^1 \hspace{.33em}\\~\\
=-20\times x^{2+1} \hspace{.33em}\\~\\
=-20\times x^{3} \hspace{.33em}\\~\\
}\end{align}\)

like this simplify the other two terms

Answer 7

That's something you must find

Answer 8

okay. Thank you both(:

Answer 9

http://openstudy.com/study#/updates/54e4c96ee4b0aba126e828fd

Answer 10

Sorry i just really need help

Answer 11

I will delete the comment

Answer 12

then go tag someone in your department

Answer 13

@beccasmith Out of principle alone I wouldn't help a person doing what you are doing here. You need to make your own thread, not try to hijack some one else's. It is rude. How would you like it if some one did that to your thread?

Answer 14

Honestly I would look at theirs and not really care.