Question

What are the exact solutions of x2 - 3x - 1 = 0?

x = the quantity of 3 plus or minus the square root of 5 all over 2
x = the quantity of negative 3 plus or minus the square root of 5 all over 2
x = the quantity of 3 plus or minus the square root of 13 all over 2
x = the quantity of negative 3 plus or minus the square root of 13 all over 2

Answer 1

do you know the quadratic formula?

Answer 2

you could use that method.

Answer 3

\[x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

Answer 4

a=1
b= -3x
c=-1

Answer 5

is that what i would plug in?

Answer 6

yes, but b is just -3

Answer 7

\[x=\frac{ 3 \pm \sqrt{9-4(1)(-1)} }{ 2 }\]

Answer 8

i tried to do that srry

Answer 9

it's okay :) can you solve the rest, or do I need to walk you through it?

Answer 10

if you could walk me through it please

Answer 11

okay well what's -4*1*-1?

Answer 12

would it be sqrt 9--4?

Answer 13

Wait is it C?

Answer 14

\[x=\frac{ 3 \pm \sqrt{9+4} }{ 2 }\]\[x=\frac{ 3 \pm \sqrt{13}}{ 2 }\]

Answer 15

yes, it is C good job :)

Answer 16

thats C! thank you so much

Answer 17

you're welcome XD

Answer 18

I became a fan :3