Detailed description
y = f(x) of f(x) = x squared + 1, parabola, region from x = 0 to point on x axis marked as x shaded between parabola and x axis, this area labelled as A(x).
Integration
y = f(x) of f(x) = x squared + 1, parabola, region from x = 0 to point on x axis marked as x shaded between parabola and x axis, this area labelled as A(x).