a)
[tex]y = {ax}^{2} + bx + c[/tex]
[tex]y = { - 5x}^{2} + 10x + 3[/tex]
b)
[tex]y = {a(x - p)}^{2} + q[/tex]
[tex]y = {1(x - (- 2))}^{2} + 9[/tex]
[tex]y = {(x + 2)}^{2} + 9[/tex]
[tex]y = {x}^{2} + 2 \times x \times 2 + {2}^{2} + 9[/tex]
[tex]y = {x}^{2} + 4x + 4 + 9[/tex]
[tex]y = {x}^{2} + 4x + 13[/tex]