Asked by BERNIE
can you help me to solve for completing the squar x^2+18x=-4
Answers
Answered by
Reiny
x^2 + 18x = -4
take half of the 18, square it, then add to both sides
x^2 + 18x <b>+ 81 </b> =-4 <b>+ 81 </b>
(x+9)^2 = 77
x+9 = ±√77
x = -9 ± √77
take half of the 18, square it, then add to both sides
x^2 + 18x <b>+ 81 </b> =-4 <b>+ 81 </b>
(x+9)^2 = 77
x+9 = ±√77
x = -9 ± √77
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