Determine f(x+a)−f(x) for the following function. f(x)=(squareroot)x+7 +5(not in square root)

Question

I need help with this question.

Answer 1

f(x) = sqrt(x+7) + 5 <--- you say the 7 is under the square root but the 5 is not

f(x+a) = sqrt( x+7+a) + 5

subtracting f(x) just cancels the 5

sqrt(x+7+a) - sqrt(x+7)