Write Newton's formula used to approximate a solution of the equation 2x3-x -15=0 and find the third iteration value. Be sure to verify both parts of the answer are correct when making your selection. 2xn -Xn-15 O Xn+1 = Xn ; X3 = 1.872499451 2-1 6Xn 2xn'-Xn -15 O Xn+1 =Xn ; X3 - 2.042527942 6Xn 2 - 1 2x-Xn -15 O Xn+1= 2+ 2-1 ; X3 ~ 1.857593743 6X 2x-Xn -15 O Xn+ 1 = 2- ; X3 - 2.044471717 6X n 12-1