A rectangular floor area can be completely tiled with 200 square tiles. If the side length of each tile is increased by 1 unit, it would take only 128 tiles to cover the floor. (i) Assuming the original length of each side of a tile be $x$ units, make a quadratic equation from the above information. (ii) Write the corresponding quadratic equation in standard form. (iii)(a) Find the value of $x$, the length of side of a tile by factorisation.

Explanation

The correct option is B because it directly addresses the requirement to solve the quadratic equation for x using the quadratic formula.