Simplify the expression: 5(x2 + x - 1) - (5x2 - x + 2) =

Step 1: Distribute the 5 into the first parentheses.
$5(x^2 + x - 1) = 5x^2 + 5x - 5$

Step 2: Distribute the negative sign into the second parentheses.
$-(5x^2 - x + 2) = -5x^2 + x - 2$

Step 3: Rewrite the expression by combining both parts.
$5x^2 + 5x - 5 - 5x^2 + x - 2$

Step 4: Combine like terms for $x^2$:
$5x^2 - 5x^2 = 0$

Step 5: Combine like terms for $x$:
$5x + x = 6x$

Step 6: Combine constant terms:
$-5 - 2 = -7$

Step 7: Simplified expression:
$6x - 7$

C. $6x - 7$
6x-7