Question

Solve for x.
x^2 +18+4=0

Answer 1

\[x^2+18x=-4\]
\[(x+9)^2=-4+81\]
\[(x+9)^2=77\]
\[x+9=\pm\sqrt{77}\]
\[x=-9\pm\sqrt{77}\]

Answer 2

completing the square here easier than quadratic formula because the "middle term" 18x has an even coefficient, so you do not have to simplify at the end

Answer 3

how do I make the plus minus sign with the keyboard?

Answer 4

\pm

Answer 5

i mean that is how i do it here