christinewilliams
Solve 8x2 + 7x - 15 = - 7. Enter your answers as decimals rounded to two places.
in order from least to greatest.
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Emily778
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an*
christinewilliams
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i got it straight
from my homework i just looked again it is the same
sanchez9457
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Is that 8 times 2?
christinewilliams
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i think it is 7x minus 15
christinewilliams
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i think it is 8 times 2 plus 7x minus 15 = negative 7.
sanchez9457
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Multiply out 8 * 2 and add it to -15
sanchez9457
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then subtraact that new value to the -7 and divide by 7 and that should give you your x.
christinewilliams
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wait so 8*2 is 16 then adding it to -15 would be 1 right
then you subtract that from -7 would be 8 and dividing it would 1.14 right? it says i have to have two decimals though so what do i do after that?
sanchez9457
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it would be -8 not 8. so it should give you -1.14 if you did your calculuations correctly.
1.14 is two decimal places. you have the tenths and the hundredths places.
christinewilliams
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no like 1.14 as one answer than there should be another answer for it
Algebraic!
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I think this is supposed to be a quadratic and you're going to want to use the quadratic formula...
Algebraic!
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first write it in the form ax^2 +bx +c =0
then plug the values of a b and c into the quad. formula
sanchez9457
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I don't quite understand this then. So that is not a multiplication like you said it's 8x?
christinewilliams
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it is from the lessons linear and quadratic functions
sanchez9457
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Oh so then that is not 8 times 2 , it's 8x^2
christinewilliams
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im so confused guys
sanchez9457
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Forgetting that little carrot is a huge thing.
christinewilliams
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it didnt have the carrot thingy
Algebraic!
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re-write it in the form ax^2 +bx +c =0
plug the values of a b and c into the quad. formula
christinewilliams
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where do i find the a b c thing
Algebraic!
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a=8 b =7 c=...?
Algebraic!
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or are you talking about the quadratic formula?
christinewilliams
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i have no clue honestly i am so confused right now
sanchez9457
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@Algebraic! : i'm not sure it's a quadratic equation sine he just said there was nothing squared. so the qudratic formula would render usless he made a mistake in copying the problem.
Algebraic!
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it's in your book or everywhere on the internet
christinewilliams
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im a girl first and second the problem is right in front of me it is right. and it is on my homework online
christinewilliams
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i got it guys thanks
sanchez9457
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Sorry about that!
christinewilliams
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no its fine thank you for trying
Algebraic!
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"im a girl first "
so?
christinewilliams
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he kept calling me a dude