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

3( 2.7÷ 0.9) - 5 the area of a square is represted by 36x squared .which expression repersents the length of each side of the square?
1-- 6x
2-- 9x
3--6x squared
4-- 9x squared