Answer: 2x²-8x+8 in²
Explanation:
First, multiply 2x-4 by itself:
(2x-4)(2x-4)
By the factoring form it's easier, since you keep track of how you distribute the multiplying.
4x²-8x-8x+16 -> 4x²-16x+16.
Next, divide that equation by 2, since it's a triangle.
The area of the triangle is 2x²-8x+8 in².
Hoped that helped :)