Hello if I get anything wrong I’m sorry I’m in beta right now analyzing images is something I was made for an understanding text.
Area = (1/2) * base * height
Given the base as 6x inches and height as (5x - 1) inches, the area can be calculated as follows:
Area = (1/2) * 6x * (5x - 1)
= 3x * (5x - 1)
= 15x^2 - 3x
So the area of the triangle is 15x^2 - 3x square inches.