## christinewilliams 2 years ago Solve 8x2 + 7x - 15 = - 7. Enter your answers as decimals rounded to two places. in order from least to greatest.

1. Emily778

an*

2. christinewilliams

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

3. sanchez9457

Is that 8 times 2?

4. christinewilliams

yes

5. christinewilliams

i think it is 7x minus 15

6. christinewilliams

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

7. sanchez9457

Multiply out 8 * 2 and add it to -15

8. sanchez9457

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

9. christinewilliams

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?

10. sanchez9457

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.

11. christinewilliams

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

12. Algebraic!

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

13. Algebraic!

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

14. sanchez9457

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

15. christinewilliams

it is from the lessons linear and quadratic functions

16. sanchez9457

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

17. christinewilliams

im so confused guys

18. sanchez9457

Forgetting that little carrot is a huge thing.

19. christinewilliams

it didnt have the carrot thingy

20. Algebraic!

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

21. christinewilliams

where do i find the a b c thing

22. Algebraic!

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

23. Algebraic!

24. christinewilliams

i have no clue honestly i am so confused right now

25. sanchez9457

@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.

26. Algebraic!

it's in your book or everywhere on the internet

27. christinewilliams

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

28. christinewilliams

i got it guys thanks

29. sanchez9457

30. christinewilliams

no its fine thank you for trying

31. Algebraic!

"im a girl first " so?

32. christinewilliams

he kept calling me a dude