Find the roots of each of the following quadratic equations if they exist by the method of completing the squares:

√5x² + 9x + 4√5 = 0

Find the roots of each of the following quadratic equations if they exist by the method of completing the squares:

2x² – 5x + 3 = 0

Find the roots of each of the following quadratic equations if they exist by the method of completing the squares:

x² – 6x + 4 = 0

Find the roots of each of the following quadratic equations if they exist by the method of completing the squares:

2x² + √15 x + √2 = 0

Find the roots of each of the following quadratic equations if they exist by the method of completing the squares:

x² + x + 3 = 0