book Maths Puzzle Numerical Ability

I need help solving lenier problem 1/2x-3/4y=6

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Given f(x)=2(x+2)^2-1 what is the domain, range, vertex, y intercept, and axis of symmetry (sketch the Graph). Show EACH step in solving each of the following equations. State if any solution is extraneous.
a. sqrt(3x + 1) = 4
b. 2x - sqrt(3x - 2) = 8
c. sqrt(2x - 1) = x - 8