SAT Lines, angles, and triangles Question

The expression $(9x-28)(15x+4)$ is equivalent to the expression $a{x}^2+bx+c$ , where $a,b,$ and $c$ are constants. What is the value of $b$ ? Rectangles ABCD and EFGH are similar: The length of each side of EFGH is 6 times the length of the corresponding side of ABCD. The area of ABCD is 96 square units. What is the area, in square units, of EFGH?