1. Samantha simplified the following expression.
a. IDENTIFY the mistake Samantha made and explain what she should have done.
b. SIMPLIFY the expression correctly.
(5x2 – 2x – 4) – (3x2 – 6x – 1)
5x2 – 2x – 4 – 3x2 – 6x – 1
2x2 – 8x – 5

Question

1. Samantha simplified the following expression.
a. IDENTIFY the mistake Samantha made and explain what she should have done.
b. SIMPLIFY the expression correctly.
(5x2 – 2x – 4) – (3x2 – 6x – 1)
5x2 – 2x – 4 – 3x2 – 6x – 1
2x2 – 8x – 5

narissa · Answer

She didn't pay attention to the minus sign between the brackets?

narissa · Answer

5x^2-3x^2+6x-2x+1-4
5x^2-3x^2+4x+1-4
2x^2+4x+1-4
2x^2+4x-3

narissa · Answer

@Vocaloid Am I correct?

narissa · Answer

@wwhitlock

wwhitlock · Answer

I got 2 x^2+4 x-3 so yes looks correct.

Hint. I'm not that good at math. I use WolframAlpha.com to help me figure stuff out. I copied the expression and pasted into wolfram. It figures it out and helps explain. It's great for checking answers.

narissa · Answer

Oh okay thank you :)