Let's simplify the expression:

$3x^2 + 7x - 2x^2 - x - 1$

1. Combine like terms:
   • Combine the $x^2$ terms: $3x^2 - 2x^2 = x^2$
   • Combine the $x$ terms: $7x - x = 6x$
   • The constant remains $-1$

So, the simplified expression is:

$x^2 + 6x - 1$

Would you like further details or have any questions?

Here are 5 related questions for practice:

1. How would you solve $x^2 + 6x - 1 = 0$?
2. What is the value of the expression when $x = 2$?
3. What happens to the expression when you factor it (if possible)?
4. How would you graph $x^2 + 6x - 1$?
5. How does the value of the expression change as $x$ increases?

Tip: Always look to combine like terms first to simplify algebraic expressions quickly.