What are the exact solutions of x2 − x − 4 = 0, where x equals negative b plus or minus the square root of b squared minus 4 times a times c all over 2 times a? (1 point) x = the quantity of negative 1 plus or minus the square root of 15 all over 2 x = the quantity of 1 plus or minus the square root of 15 all over 2 x = the quantity of 1 plus or minus the square root of 17 all over 2 x = the quantity of negative 1 plus or minus the square root of 17 all over 2