Question

Solve 8x2 + 7x - 15 = - 7. Enter your answers as decimals rounded to two places.
in order from least to greatest.

Answer 1

an*

Answer 2

i got it straight
from my homework i just looked again it is the same

Answer 3

Is that 8 times 2?

Answer 4

yes

Answer 5

i think it is 7x minus 15

Answer 6

i think it is 8 times 2 plus 7x minus 15 = negative 7.

Answer 7

Multiply out 8 * 2 and add it to -15

Answer 8

then subtraact that new value to the -7 and divide by 7 and that should give you your x.

Answer 9

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?

Answer 10

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.

Answer 11

no like 1.14 as one answer than there should be another answer for it

Answer 12

I think this is supposed to be a quadratic and you're going to want to use the quadratic formula...

Answer 13

first write it in the form ax^2 +bx +c =0
then plug the values of a b and c into the quad. formula

Answer 14

I don't quite understand this then. So that is not a multiplication like you said it's 8x?

Answer 15

it is from the lessons linear and quadratic functions

Answer 16

Oh so then that is not 8 times 2 , it's 8x^2

Answer 17

im so confused guys

Answer 18

Forgetting that little carrot is a huge thing.

Answer 19

it didnt have the carrot thingy

Answer 20

re-write it in the form ax^2 +bx +c =0
plug the values of a b and c into the quad. formula

Answer 21

where do i find the a b c thing

Answer 22

a=8 b =7 c=...?

Answer 23

or are you talking about the quadratic formula?

Answer 24

i have no clue honestly i am so confused right now

Answer 25

@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.

Answer 26

it's in your book or everywhere on the internet

Answer 27

im a girl first and second the problem is right in front of me it is right. and it is on my homework online

Answer 28

i got it guys thanks

Answer 29

Sorry about that!

Answer 30

no its fine thank you for trying

Answer 31

"im a girl first "

so?

Answer 32

he kept calling me a dude