Question

how can i solve a quadratic equation like this 6x^2-5+x=0

Answer 1

rewrite it in the normal form and plug into the quadratic equation:

\[ax^2 + bx + c = 0 \implies x = \frac{-(b) \pm \sqrt{(b)^2-4(a)(c)}}{2(a)}\]

Answer 2

thank you i did that part but where i am getting cofused at is that addition/ subtraction sign i dont kno what to do with it sorry i didnt say that earlier

Answer 3

Oh, well unless the part under the square root is 0 you will get 2 different possible solutions.

\[x = \frac{-(b) + \sqrt{(b)^2-4(a)(c)}}{2(a)}\]
and
\[x = \frac{-(b) - \sqrt{(b)^2-4(a)(c)}}{2(a)}\]

The \(\pm\) thing just makes it easier to write.

Answer 4

oh ok thank you i'ma try it now :D

Answer 5

HOW WOUD I GET THAT SQUARE ROOT SYMBOL ON THE CALCULATOR

Answer 6

It should have it. If not you can raise it to the .5 power.

Answer 7

LIKE THIS (1^2-4(6)(-5)^5

Answer 8

it gave me some crazy number how would you do it i guess i was wrong

Answer 9

i got 2.59374246E10

Answer 10

Not quite. What do you have before you plug it in?

Answer 11

i did 1^2-4(6)(-5) and i recieved 121 but then i raised that to the 5th power and i got that wierd number

Answer 12

but then instead of that i subtracted -5 then i divided by 12 and i got 10.5

Answer 13

?

Answer 14

why did you raise to the 5th. I said .5 or 0.5 or 1/2

Answer 15

that's probably the issue.

Answer 16

i still dnt get it i'm sorry for wasting your time!

Answer 17

Your calculator doesn't have a square root button?

Answer 18

it does but it is a blue sign above the X^2 button i cnt seem to get the sign but i always get the X^2

Answer 19

?

Answer 20

What kind of calculator do you have

Answer 21

a TI-84 PLUS SILVER ADDITION

Answer 22

Do you see the blue func button? Press that first, then press the x^2 button.

Answer 23

err should say 2nd on it.

Answer 24

I GOT IT! yah thanx yu

Answer 25

i got a -48

Answer 26

The square root of 121 is 11

Answer 27

So you should have
\[x = \frac{-1 \pm 11}{2(6)}\]

Answer 28

i feel so dum sorry!

Answer 29

sorry

Answer 30

hrm?

Answer 31

i got 32and -34 do i put down both of my answers

Answer 32

How do you get that?

Answer 33

-1 + 11 = 10
-1 - 11 = -12

So you should have 10/12 and -12/12 = -1

Answer 34

omg! im sorry but im dne i cnt do this!

Answer 35

I don't understand what's confusing you.

Answer 36

If you can explain I can try to help.

Answer 37

i just dont know how to do this im basically confused about evrything i dnt know what else to do

Answer 38

Well hang on.

Answer 39

Can you simplify the expression

\[\frac{4+3}{8}\]

Answer 40

7/8

Answer 41

1.142857143?

Answer 42

no im sorry 7/8

Answer 43

u k i have no idea wat ur sayin im in 5th grade
'

Answer 44

?

Answer 45

Yes, 7/8 is correct

Answer 46

Now try this one:

\[\frac{4-3}{2(4)}\]

Answer 47

polpok ur awesome

Answer 48

heh, thanks.

Answer 49

np

Answer 50

When working with fractions like this, just try to simplify the top and bottom separately.