Answer:
C. 5x + 5
Step-by-step explanation:
To simplify the given expression, you just need to combine like terms:
(9x^2 + 10x + 4) - (9x^2 + 5x - 1)
First, distribute the negative sign:
= 9x^2 + 10x + 4 - 9x^2 - 5x + 1
Now, combine like terms:
= (9x^2 - 9x^2) + (10x - 5x) + (4 + 1)
= 0x^2 + 5x + 5
Since 0x^2 is just 0, you're left with:
= 5x + 5
So, the simplified form of the expression is C. 5x + 5.