What is the coefficient of x after simplifying (−x−5)2?
Answer
A
−25
B
−10
C
10
D
25
Explanation
Square each term using (a+b)² = a² + 2ab + b². For (−x−5)², the middle term is 2(−x)(−5) = 10x, so the coefficient of x is 10. The correct choice is 10.
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