To complete the square for $x^2+10x=18,$ we add $(10/2)^2=25$ to both sides: \begin{align*}
x^2+10x &=18 \\
x^2+10x+25 &= 18+25 \\
(x+5)^2 &= 43 \\
x+5 &= \pm \sqrt{43} \\
x &= -5\pm \sqrt{43}.
\end{align*}Rounding to the nearest hundredth gives the answer $\boxed{\textbf{(A)}\,-11.56, 1.56}.$
Solve the equation by completing the square. Round to the nearest hundredth if necessary.
x squared plus 10 x equals 18
A. negative 11.56 comma 1.56
B. 11.56, 1.56
C. negative 11.56, negative 1.56
D. 11.56, negative 1.56
1 answer