What is the equation of the square root function graphed below? Graph of square root function starting at the point negative one comma negative two and going down to the right through the point zero comma negative six and continuing towards negative infinity. y equals two square root of x minus one end square root minus four y equals negative two square root of x minus one end square root plus four y equals negative four square root of x plus one end square root minus two y equals negative two square root of x plus one end square root minus four