exam Maths Puzzle Numerical Ability

Find all real solutions to the equation.
the sqare root of x+4 minus 2 time the sqare root of x-1 = -1

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exam Other Question

there are 3 roads connecting town A and B, and 4 roads connecting towns B and C. how many different routes are there from town A to town C? x=(a^2+b^2+ab)/(a^2+b^2-ab) ; y=(a+b)/(a-b) find (x^2+y^2)/(x^2-y^2)