exam Maths Puzzle Numerical Ability

Find the distance between each pair of points

(-3, 0) (4, 0)

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exam Other Question

I really am having a hard time with this problem. the 2x in the middle confuses me.
-4x is less than or equal to 2x<18 consider the function: f(x)= x^2+6x-2. Find h, the x-coordinate of the vertex of this parabola.