Determine the area of the red triangular region.
4x+2
M
x
2x-2
$

The area of the triangle. (WHOLE)
[tex](4x+2)(2x-2)=8x^{2} -4x-4[/tex]
The area of the gray square.
[tex](x)(x+1)=x^{2} +x[/tex]
Subtract.
[tex](8x^{2} -4x-4)-(x^{2} +x)\\=7x^{2} -3x-4[/tex]
Hope this helped.