can you help me to solve for completing the squar x^2+18x=-4

Answer 1

x^2 + 18x = -4
take half of the 18, square it, then add to both sides
x^2 + 18x + 81 =-4 + 81
(x+9)^2 = 77
x+9 = ±√77
x = -9 ± √77