Answer:
we have
(-x -5) to the power of 2
we know that
(-x -5) to the power of 2 = (-x -5) x (-x -5)
To multiply two binomial I can use the FOIL method
(-x -5) x (-x -5) = (-x) x (-x) + (-x) x (-5) + (-5) x (-x) + (-5) x (-5)
= X to the power of 2 + 5x +5x + 25
= x to the power of 2 +10x +25
therefore
the answer is
the missing coefficient of the x-term is 10