Solve the following quadratic equations by completing the square. Leave your answers in simplified exact form (i.e., as fractions or surds where necessary).
Solve: $x^2 + 6x - 7 = 0$
Solve: $x^2 - 8x + 10 = 0$
Solve: $x^2 + 5x - 3 = 0$
Solve: $x^2 - 12x + 36 = 0$
Solve: $2x^2 + 12x - 4 = 0$
Solve: $3x^2 - 6x - 5 = 0$
Solve: $x^2 - 3x - 1 = 0$
Solve: $5x^2 + 10x + 1 = 0$
Solve: $x^2 + 2x + 5 = 0$
Solve: $2x^2 - 5x - 4 = 0$