The area of a rectangular shaped cake is 507 cm2 .
The length of the cake is three times bigger than the width? What is the length and width of the cake?
width === x
length is 3 times bigger ==== > length = 3x
area = length * width
507 = x(x+3)
expand, re-write in standard quadratic notation, then solve
using your favorite method to solve quadratics.