book Maths Puzzle Numerical Ability

Please solve for me
Find the domain of a. y=5x2-4x+4
b. 7=1/x2-1

c. y=x-3

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book Other Question

Write an expression for the perimeter of the traingle. Example one side of triangle is
3x another is 4x and the others is 5x. Which expression do i write? The power p (in watts) generated by a windmill that has efficiency E is given by the formula P=0.31ED^2V^3, where D is the diameter (in feet) of the windmill blades and V is the wi