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Mathematics 16 Online
OpenStudy (anonymous):

help

OpenStudy (anonymous):

divide by 5 and move everything to one side x^2 + 6x + 13 = 0

OpenStudy (solomonzelman):

\(\large\color{black}{5x^2 = -30x - 65 }\) add 30x and then 65 to both sides \(\large\color{black}{5x^2 + 30x + 65=0 }\) divide each term in equation by 5. \(\large\color{black}{x^2 + 6x + 13=0 }\)

OpenStudy (anonymous):

divide everything by 5

OpenStudy (anonymous):

and then you'll have to use the quadratic equation to solve for x

OpenStudy (solomonzelman):

you can't factor it, so I would complete the square. subtract 4 from both sides.

OpenStudy (solomonzelman):

all your answers are imaginary.

OpenStudy (anonymous):

That works too

OpenStudy (solomonzelman):

\(\large\color{black}{x^2 + 6x + 13=0 }\) \(\large\color{black}{x^2 + 6x + 13-4=0-4 }\) \(\large\color{black}{x^2 + 6x + 9=-4 }\)

OpenStudy (solomonzelman):

go on...

OpenStudy (solomonzelman):

what is the square root of -4? have you learned about imaginary numbers (such as i) ?

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