Step 1
Given;
[tex]1s^2+10s^2-21st[/tex]
Required; To simplify by combing terms
Step 2
Combine like terms.
[tex]1s^2\text{ and }10s^2[/tex]
Therefore, we will add them together
[tex]1s^2+10s^2=11s^2[/tex]
The full solution will be;
[tex]11s^2-21st[/tex]
Answer;
[tex]11s^2-21st[/tex]
