Question

COuld someone help me with this...
Which of the following is a solution of x2 + 6x = -22?

Answer 1

do you know the quadratic formula ?

Answer 2

Compare your quadratic equation with \(ax^2+bx+c=0\)
find \[a=...?\\b=...?\\c=...?\\\] \[ \\ \sqrt{b^2-4ac}=...?\]
then the two roots of x are:
\(\huge{x_{1,2}=\frac{-b \pm \sqrt{b^2-4ac}}{2a}}\)


did you follow these steps ?

Answer 3

a=1,b=6,c=22

Answer 4

b^2-4ac = 36-4*22 = 36 -88= -52

oh, you got your error ? try again and see whether you get it now :)

Answer 5

what about the denominator 2a = 2 ?

Answer 6

thats right, none of the choices are correct

Answer 7

-6 +/- sqrt (-52) / 2
= -3 +/- i sqrt 13

could you get how i got that final answer ?

Answer 8

thats the correct answer and its not in choices....
so either the question is incorrect or the options...

Answer 9

i did use the imaginary number,
\(\sqrt{-52}= \sqrt{-1}\sqrt{52}=i \sqrt {52}=2i \sqrt 13\)