Factoring Trinomials: Using quadrilaterals

What is the area of a rectangle with sides of x-7 and x+8?

$x^2+x-56$

Look at the rectangle in the figure.

What is its area?

$x^2+2x-8$

Express the sides of the given rectangle.

$x+1,x+2$

Express the sides of the rectangle in the drawing by x.

$x+11,x+2$

Look at the rectangle in the figure.

Express its sides in terms of b.

$b+7,b+3$