If anyone can help with any of these questions please post
1) y= √(16-x) , where y= 5
2) y= √(x-7) , at x= 16
3) y= 8/(√(x+11)) , at x=5
This next step will likely go against every simplification rule you ever learned in Algebra. Then again, this is Calculus, not Algebra.
We're going to rationalize the numerator. Why? Because it works.
Now take the limit:
Now go ahead and put the x value in.