book Maths Puzzle Numerical Ability

How do I solve an equation which begins like this.

radical x-3-7=0

radical 4x^2+x-3=2x

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book Other Question

I need your help on this one.................Choose the equation of the parabola that opens to the right, has the vertex
(-3,4) and goes through the points (5,-4).
a. (y+4)^2=4 a boat is going a distance of 600km. the way upstram had a current with it at 50 km/h while the one back against the current was 50 km/h also. The total time of the one there was one less thamn the one back. What is the spped of the boat in still air?