exam Maths Puzzle Numerical Ability

Find all real solutions to the equation.

square root x+4 - 2square root x-1 = -1

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exam Other Question

2 2
(x+y) + (x+3y) - 10(x+3y) - 4(x+y) +29 = 0 , find the value from next expresion

2
2y + xy

This problem is not from textbook. I need to factor x2-6x-16=0. What I have is (x-4),(x-4) or (x-2), (x-8) as my answers. I am having a hard time looking at the example in my book vs. what my teacher gave us for our assignment.