Answer:
[tex]4a^2+7ab-b^2[/tex]
Step-by-step explanation:
First, we will sum
[tex]3a^2-ab-2b^2[/tex]
and
[tex]2a^2+5ab-3b^2[/tex]
Then, from that sum, we will SUBTRACT [tex]a^2-3ab-4b^2[/tex]
First, lets take the sum by combining like terms:
[tex](3a^2-ab-2b^2)+(2a^2+5ab-3b^2)=5a^2+4ab-5b^2[/tex]
Now, lets do the subtraction:
[tex](5a^2+4ab-5b^2)-(a^2-3ab-4b^2)\\=5a^2+4ab-5b^2-a^2+3ab+4b^2\\=4a^2+7ab-b^2[/tex]
This is the answer.
