book Maths Puzzle Numerical Ability

please help!!

x - 3sqrt(x) - 4 = 0

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book Other Question
Rationalize the denominator.

Please assist me with this problem.
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√ 25p^7
....r



Actual problem is here
http://www.ccaurora.edu/mat090/Tests/test_chapter_8_files/image030.gif give the coordinates of the focus and the equation of the directrix for the parabola with equation x=-4y^2