Consider the figure.

(a) What must be true about the expressions for the area of the blue square found in Exercises 124 and 128?(b) Write an equation based on the answer in part (a).

Data from in Exercises 124 and 128

What is the formula for the area of a square? Use the formula to write an expression, in the form of a product, for the area of the blue square.

Exercises 128

The area of the blue square is equal to the area of the entire colored region, minus the total area of the green squares, minus the area of the yellow square. Write this as a simplified polynomial in a and b.

a b b