For each of the following quadratics:
- Write the quadratic in completed square form.
- Write the quadratic in factored form.
- Sketch the graph of the quadratic, identifying its axes intercepts, vertex, and axis of symmetry.
(1) a** y=x2+4x+3
(2) b** y=x2+2x−3
(3) c** y=2x2−8x−10
(4) d** y=−x2+6x+7