Answer:
[tex]-r^2-3r+4[/tex]
Step-by-step explanation:
The question is to simplify the expression [tex](2r^2+r-1)-(3r^2+4r-5)[/tex]
First, we can eliminate the 2nd parenthesis expression by changing signs of all the terms since there is a "-" sign in front. Then we add the "Like Terms". The process is shown below:
[tex](2r^2+r-1)-(3r^2+4r-5)\\=2r^2+r-1-3r^2-4r+5\\=-r^2-3r+4[/tex]
The first answer choices (has some typos) is correct. The correct answer is [tex]-r^2-3r+4[/tex]
