Answer: 5x + 22
Step-by-step explanation: Not sure if this is correct, but the area of the blue region is the area of the entire figure minus the white region. So, we have (x + 6)(x + 5) - (x + 2)(x + 4) = x^2 + 11x + 30 - (x^2 + 6x + 8), which the two x^2 cancel out, which leaves you with 5x + 22