exam Maths Puzzle Numerical Ability

The width of a rectangular box is 4 times its height, and its length is 3 ft more than its height. The volume of the box is 49 ft cube. Find the height of the box.

volume = lwh
49 = (4x)(3+x)(x)
49 = 4x3 +12x2

Read Solution (Total 0)

exam Other Question

My problem is to find the number c such that the vertex of f(x)=x^2+8x+c lies on the x-axis. How do I proceed with this problem?
Find a, b, and c such that the graph of y= ax^2 + (b times the square root of x) + c goes through the points (0,3), (1,-1/2), and (4,3). Any help would be much appreciated.