algebra 1 NEED NOW!!! PLEASE HELPPP
posted by lisa .
A rectangular picture measuring 3 in. by 7 in. is surrounded by a frame with uniform width x. Write a quadratic function in standard form to show the combined area of the picture and frame.

length = 7 + 2x
width = 3 + 2x
area = (2x+7)(2x+3)
etc