Question

quadralic formula to find any x-intercepts
y=x^2-6x-6

Answer 1

guadratic formula sorry mispelled

Answer 2

JIthinkv

Answer 3

ok... so to find the xx intercepts, you'll need to solve the equation when y=0...
ie.
\(\large 0=ax^2+bx+c \)
can you identify the coefficients a, b, and c for me....
a=
b=
c=

Answer 4

a=1
b=6
c=6

Answer 5

but what happens if the problem say -6x-6 would it still be 0=ax^2+bx+c

Answer 6

be careful... b=-6, c=-6

Answer 7

that is what I was just wondering, them negative get me all of the time

Answer 8

so now that you have the correct values for a, b, and c, plug them into the quadratic formula...
\(\huge x=\frac{-b\pm \sqrt{b^2-4ac}}{2a} \)

Answer 9

so then it would be 0=1x^2+-6x+-6 right

Answer 10

yes...

Answer 11

\(\huge x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}=\frac{-(-6)\pm \sqrt{(-6)^2-4(1)(-6)}}{2(1)} \)
simplify...

Answer 12

that is what I was doing wow you are fast

Answer 13

ok so would you just divide all of this by 2?

Answer 14

yes... the denominator is 2 hopefully some things can cancel (simplify)... let's see...

Answer 15

\[3\pm \sqrt{3^{2}-(2)(12)}\]

Answer 16

\(\large x=\frac{-(-6)\pm \sqrt{(-6)^2-4(1)(-6)}}{2(1)}=\frac{-6\pm \sqrt{36+24}}{2}=\frac{-6\pm \sqrt{60}}{2} \)

Answer 17

you can't cancel out the 2 in the denominator after you simplify that radical first....

Answer 18

wow I was way off so you would not divded the 6/2 you would just fdo the qdrt which is 36

Answer 19

nooooo..... simplify the radical first....

Answer 20

so what you have at the end is the answer? \[\frac{ -6\pm \sqrt{60} }{ 2 }\]

Answer 21

no... that can be simplified...

Answer 22

I thought that you would take it to the lowest which it would be \[\frac{ -3\pm \sqrt{30} }{2 }\]

Answer 23

right

Answer 24

\(\large \frac{6 \pm \sqrt{60}}{2}= \frac{6 \pm 2\sqrt{15}}{2}=\frac{\cancel{6}^3 \pm \cancel{2}^1\sqrt{15}}{\cancel{2}^1}=3\pm \sqrt{15}\)

Answer 25

then I would do 30/2 right

Answer 26

i think that's it....

Answer 27

30/2 ????

Answer 28

15

Answer 29

why are you calculating 30/2 ???

Answer 30

do not know but I get what you did now thanks for your help I would have never got that