How do I find the area of the shaded region.

-2x^2 - 32x
Find the area of the entire grey area without the white...
(2x-8)(4x) = 8x^2 - 32x
Find the area of the white...
(5x)(2x) = 10x^2
Subtract the area of the white from the grey...
(8x^2 - 32x) - (10x^2) = -2x^2 - 32x
i solved others lol this isn't right
-2x^2 - 32x
Find the area of the entire grey area without the white
(2x-8)(4x) = 8x^2 - 32x
Find the area of the white
(5x)(2x) = 10x^2
Subtract the area of the white from the grey