exam Maths Puzzle Numerical Ability

Below, the picture represents two parallel lines like the ones of windshields wipers in a car. The slashes represent the parallel lines as best as possible.

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Consider the function f(x)=x^2+4x+1
a) Find h, the x-coordinate of the vertex of this parabola.
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b) Substitute the two whole n 1. (2x + 7)(-3x^2 + 11x - 8)
2. 3x(-4x2 + 5x + 14)
3. (7x^3 + 3)(6x^5 - 2)
4. (3/4X^3 - 1/3)(1/5X^2 + 3/7)
5. (7x^3 - 11x^2 + 2x)(-4x^2 - 5x + 8)
6. (7x - 5)^2
7. (3x +