book Maths Puzzle Numerical Ability

What is the vertex of the parabola

F(x)= 4x^2 + 40x - 5

Line of symmetry of this function
y=3x^2 - 36x + 115

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book Other Question

Find the area of a circle whose radius is 47 cm. Use 3.14 for pye.

a) 3468.13cm squared b) 6936.26 cm squared
c) 13872.5 cm squared d) 259.16 cm squared
okay, i have one simple question because i left my math book at home :X
3 / x+1 - 3/x-1

I know you must first change the subtract to add, and make the 3 negativ