When our class first learned how to subtract polynomials, I was away. When it came to the test, I thought i had understood how to do it, but obviously not. On it, I didn’t do good. Looking back on the quiz, I notice the mistakes I had made.

For example, there was **(2x-6)+(x+4)-(4x+1)**. I wrote down what i thought was an easier way to look at it:**(2x-6)+(x+4)+(4x-1)**, and that I didn’t combine x with 4x and 2x. In total, the math I had done was **(2x+4x)+(-6-1)+x**. Making those mistakes, I came up with the answer **6x-3+x**. Looking at it now, I should have simplified the question to **(2x-6)+(x+4)+(-4x-1)**, that way I can get the correct answer of -x-3. The math I did was **(2x+x-4x)+(-6+4-1)**.

Another example is **(-5-3x*-2)-(4x+x*-8)**. Out of the 4 questions in this section, this was the hardest one, even doing the second time. At first, I got it wrong while correcting it, but I used a math calculator app and I figured out where I went wrong. During the quiz, I simplified it to **(-5-3x*-2)+(4x-x*+8)**, and got the answer of **-x-4x*+6**. My math was **(-3x*-x*)+(-5x+4x)+(-2+8)** I should have simplified it to **(-5x-3x*-2)+(-4x-2x+8)**, and get the answer **-4x*-9x+6**. The math should have been **(-3x*-x*)+(-5x-4x)+(-2+8)** When correcting it the first time, i accidentally did **3x*-x*** instead of **-3x*-x***, so i got 2x* instead of -4x*, which confused me, but i got the right answer in the end.

(Note: I am using * as a symbol for squared)

VIDEO:

WEBSITE: