Question

Solve the equation by completing the square: x2 + 2x = 120
Choose one answer.
a. x = -12 or 10
b. x =-12 or -10
c. x =12 or x =10
d. x = 12 or -10

Answer 1

\[x^2+2x=120\]
\[(x+1)^2=120+1=121\]
\[x+1=\pm\sqrt{121}\]
\[x+1=11\] or
\[x+1=-11\]
\[x=10\] or
\[x=-12\]

Answer 2

oh thats wat i did wrong i got 10 or 12 for my answer thnk u