The length of the top of the table is 5 m greater that the width The area is 84 m2 Find the dimensions of the table in meters?

7m x 12m

(X) x (X+5) = 84

X2 + 5X = 84

X2 + 5X - 84 = 0

Using the Quadratic Equation yields X=(+/- 7)

You can't have a negative dimension, so X = 7.