Question 100955
x^2 + 16x = -43
x^2+16x+(16/2)^2=-43+(16/2)^2
x^2+16x+(16/2)^2=-43+64
x^2+16x+(8)^2=21
(x+8)(x+8)=21
(x+8)^2=21
{{{(sqrt(x+8)^2))}}}={{{(sqrt(21))}}}
x+8={{{(sqrt(21))}}}
x= -8 -+ {{{(sqrt(21))}}}