Question

Use the quadratic formula to solve for x

8x^2 - 7x = -1
Round your answer to the nearest hundredth.
If there is more than one solution, separate them with commas.

Answer 1

The answer I keep getting is \[x =\frac{ 7\pm \sqrt{17} }{ 16 }\]

Answer 2

but my answer box will only let me type in individual answers...

Answer 3

ok we want all the numbers on one side so lets add one to both sides
\[8x^2 - 7x +1=0\]
now list the A B C values

Answer 4

A = 8x^2
B = 7x
C = 1

Answer 5

Good now plug them in
\[x=\frac{ -b ± \sqrt(b^2 - 4ac) }{ 2a }\]

Answer 6

Wait

Answer 7

-7x=b

Answer 8

Plug it in
a=8
b=-7
c=1

Answer 9

or else find two numbers such that their \(\Large\ Product\) is 8 and their \(\Large\ Sum\) is -7

Answer 10

@rvc it says to use the quadratic formula

Answer 11

Not factor

Answer 12

Ah okay :)
but you can check this way too ;)
plug in the values :)

Answer 13

\[x = -7\pm \frac{ \sqrt{7^2-4*8*1} }{ 2*8 }\]

Answer 14

ok sorry I had to retype out the equation like 3 times.. I kept messing up

Answer 15

"If there is more than one solution, separate them with commas."

Answer 16

a neg times a neg is a pos :P
\[\frac{-(-7) ± \sqrt((-7)^2 - 4(8)(1) }{ 2(8) }\]

Answer 17

You are mixing up your signs...

Answer 18

Your initial answer is correct, which can be written as two answers:
\(\frac{ 7+ \sqrt{17} }{ 16 }\),\(\frac{ 7 - \sqrt{17} }{ 16 }\)

Answer 19

no I know I just can't seem to get to that point as far as I get is that quadratic equation but after that I'm not sure where to go to get the individual answers ( It won't let me do fractions or all of that though I literally have boxes to type in like real numbers but that's it)

Answer 20

You may have to write it as
(7+sqrt(17))/16,(7-sqrt(17))/16
but that depends on the application you're using. There would be help/instructions to guide you.

Answer 21

@kidrah69 is right,
"Round your answer to the nearest hundredth. "
I missed that.

Answer 22

So evaluate the numbers and type in two real numbers, separated by a comma.
@Cassandra_Lea_96

Answer 23

I don't know why that wasn't obvious to me... thanks aha

Answer 24

:)

Answer 25

so 0.18 and 0.70 I changed the fractions to decimals then rounded to the nearest hundreth @mathmate

Answer 26

The solutions are correct, and correctly rounded.
Do not forget to separate the solutions by a comma as instructed.
Instructions did not specify order, so you can answer in any order you want (i.e. 0.18,0.70 or 0.70,0.18 )

Answer 27

ok =) thanks again!