Write each of these expressions in the form a(x + b) + c or c - a(x

Write each of these expressions in the form a(x + b)² + c or c - a(x + b)².

a) 6x² + 12x – 3

b) 3x² – 6x – 15

c) 3x² – 18x + 4

d) 4x² + 24x – 9

e) 5 – 2x – 2x²

f) 5x² – 20x + 2

g) 4 + 3x – 2x²

h) 3x² + 5x + 1