Answer:
2s² + 6s + 3
Step-by-step explanation:
Same variable with same exponents are like terms.
3x , 4y , x² , -5y , 2x , 11x²
In this example, like terms are:
(i) 3x & 2x
(ii) 4y and -5y
(iii) x² and 11x²
3s² + 11s - s² - 4 - 5s + 7
Combine the like terms,
3s² - s² + 11s - 5s - 4 + 7 = 2s² + 6s + 3