book Maths Puzzle Numerical Ability

let f(X)= 5xsq-2x

find a(t+3)



find the domain of f(X)= sq root 5x-4

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book Other Question

I have 2 problems i need help with,and if you could break it down so i can understand how to solve these.

1:Solve by factoring,
x^2 - 9x = -20

2: Solve by completing the square,
x^2 + 8x + 13 = 0


Thank you
For the Function f(x)=x^3-12x
Its Local Maximum is the point ( , );
Its Local Minimum is the point ( , ).