Question 5 (Multiple Choice Worth 2 points)

(03.08)

Solve -2x2 +3x - 9 = 0.

x equals quantity of 3 plus or minus 3i square root of 7 all over 4
x equals quantity of 3 plus or minus 9i square root of 7 all over 4
x equals quantity of negative 3 plus or minus 3i square root of 7 all over 4
x equals quantity of negative 3 plus or minus 9i square root of 7 all over 4

Question

Question 5 (Multiple Choice Worth 2 points)

(03.08)

Solve -2x2 +3x - 9 = 0.

 x equals quantity of 3 plus or minus 3i square root of 7 all over 4
 x equals quantity of 3 plus or minus 9i square root of 7 all over 4
 x equals quantity of negative 3 plus or minus 3i square root of 7 all over 4
 x equals quantity of negative 3 plus or minus 9i square root of 7 all over 4

anonymous · Answer

Im new here but i really need help :(

sleepyjess · Answer

Hey there! Welcome to OpenStudy!

anonymous · Answer

thanks

sleepyjess · Answer

Just wondering, is this a quiz?

anonymous · Answer

sort of yea

anonymous · Answer

Can you help?

anonymous · Answer

@sleepyjess

sleepyjess · Answer

Is it like a lesson review? I have those :)

anonymous · Answer

Its one of those quizes on flvs that lets you redo the assignment 3 times

sleepyjess · Answer

Yeah, it is pretty much a lesson review

dtan5457 · Answer

You will want to use the quadratic formula
a=-2
b=3
c=-9

dtan5457 · Answer

$$\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }$$

dtan5457 · Answer

just plug them in and simplify to get x

anonymous · Answer

okay thanx ill try it out then come back to you @dtan5457

anonymous · Answer

so inside the radical is it -63? @dtan5457

dtan5457 · Answer

yes

anonymous · Answer

yayy so uhh idk how to simplify the rest.

dtan5457 · Answer

-2x2 +3x - 9 = 0

are you sure there is a negative in front of that two

anonymous · Answer

ik its a complex solution but thats about it @dtan5457

dtan5457 · Answer

one of your answer choices has to be over -4, not positive 4

anonymous · Answer

Thats basically all the answer choices they gave me

dtan5457 · Answer

oh wait never mind, i see it.

dtan5457 · Answer

$$\frac{ -3\pm \sqrt{-63} }{ -4 }$$

dtan5457 · Answer

when you plug it all in you get that, which of those simplify to that?

anonymous · Answer

Yea thats what i have,and wdym

dtan5457 · Answer

you can further simplify that radical of -63

anonymous · Answer

dont you get a decimal?

dtan5457 · Answer

what perfect squares multiplied with any number equals 63?

4,9,16,25,36, etc

dtan5457 · Answer

you don't actually find the square root of -63

dtan5457 · Answer

but it can be put into simplified form

dtan5457 · Answer

how about i give you an example

anonymous · Answer

No thank you lol

dtan5457 · Answer

lol, do you know what i'm talking about though? its extremely important you get the concept..

acxbox22 · Answer

there is no solution if the number under the radical is negative in the quadratic formula

dtan5457 · Answer

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