book Maths Puzzle Numerical Ability

The length of a rectangle is 8 feet longer than its width which has the same dimensions as the sides of a square. If the area of the rectangle is equal to 160 square feet more than

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there are two solutions for the equation {{{bx^2-cx+a^2=0}}} (where a,b,and c are constants, and x is the unknown). They differ by the sign of the square root. Enter the the on wit dear : i want to solve this limit

limit ( sin x - tan x ) / x^3 at x tandes to 0