Using Standard Form to Graph 3 Parabola In Exercises 38, write the quadratic function in standard form and sketch its graph. Identify the vertex, axis of symmetry, and x-intercept(s). 3. g(x) = x2 2x 4. f(x) = x2 + 8x + 10 5.h(x)=3+4xx2 6. f(t)=2t2+4t+1 7. h(x) = 4x2 + 4x + 13 8. f(x) = (x2 + 5x 4)