exam Maths Puzzle Numerical Ability

Consider the function f(x) = x^2 + 4x + 1 . Find h, the x-coordinate of the vertex of this parabola

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exam Other Question

please help me find the 100th term of 25, 10, -5, -20,....... Can you help me with solving a rational equation? The problem is:
x^2/x+4 + 8x+16/x+4. I could not find any problems like this worked on this site. Thanks.