Find all real solutions of the equation by completing the square.
4x^2 + 5x − 4 = 0

Question

Find all real solutions of the equation by completing the square.
4x^2 + 5x − 4 = 0

blurbendy · Answer

x = 1/8 (-5 - Sqrt[89])
x = 1/8(Sqrt[89] - 5)

anonymous · Answer

Thats actually the answer i got but im wondering why it says it is wrong on my online homework...? Thanks thou !!

anonymous · Answer

In your opinion do you think putting the answer as a decimal is wrong?

anonymous · Answer

because when i put the answer the way you wrote it , it said it was correct

blurbendy · Answer

you put it in as a decimal?  It depends on what the question wanted.  If it wanted the answer in the exact form then you would enter it like how I did.  If it asked for a numerical approximation, or a decimal, then you would use a decimal.  If it says neither, then just enter it in the exact form.

anonymous · Answer

Alright thank you :) yeah it wasn't specified but that's what i don't like about this online stuff ... sometimes it takes the decimal and sometimes doesn't thanks a lot though :)

blurbendy · Answer

no problem!  if you have any other questions just ask