Alex C.

asked • 03/12/16

How to solve this quadratic equation ?

Hi, I'm having a hard time solving this. I keep getting the wrong answer : 
 
(x+2)2 - 5(x+3) +6=0 

1 Expert Answer

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Mark M. answered • 03/12/16

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(x + 2)2 - 5(x + 3) + 6 = 0
x2 + 4x + 4 - 5x - 15 + 6 = 0
x2 - x - 5 = 0
 
Use the quadratic formula to determine two real irrational roots.
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Alex C.

Thanks Mark! I actually finally endEd up getting the right answer right after posting my question 
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03/12/16

Mark M.

And that is the best learning experience!
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03/12/16

Michael J.

Using the quadratic formula can also give you two complex roots.  But that is a lesson for another day.
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03/12/16

Mark M.

Hmmmm, I got (1 ± 2√5) / 2.
Might be an error?
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03/12/16

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