exam Maths Puzzle Numerical Ability

The volume of a box is 2p^4 + 14p^3 + 20p^2. The height is p and the width is p + 5. What is the length?

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exam Other Question

While I can solve basic quadratic equations I am having problems figuring out how to solve the equations where you complete the square when ax^2+bx+c is equal to a number other than 0. For example:

-2.2x^2-7.4x+0.7=0.8 given a circle with the radius of 3960 miles, assume that the distance AB is a straight line, and triangle AOB is a right triangle with a right angle at B. Angle O is 1/60 of 1 degree. Find the distance of AB.