A roof truss is in the shape of a triangle with height of x feet and a base of 2x + 1 feet. Write a polynomial A (x) that represents the area of the triangle. Find A (5).

Answer 1

Area of a triange = 1/2(base x height)
so
Area of your triangle
= A(x) = 1/2(x)(2x+1)

then A(5) = 1/2(5)(11)
= 55/2 ft^2