## Algebra 2 (1st Edition)

$x=5$.
We know that the area of the triangle is half the product of the base and its according height. Hence here: $(5x-2)(2x)\cdot0.5=115\\5x^2-2x-115=0\\(5 x + 23) (x - 5)=0$ Thus $x=5$ or $x=-4.6$ but $x$ has to positive, thus $x=5$.