Question

will fan and medal for homework help!

Answer 1

Solve each equation using the quadratic formula.

Answer 2

x^2+8x+12=0

Answer 3

Do you know what the quadratic formula is?

Answer 4

yes, i do

Answer 5

-b (plus or minus) square root b^2-4ac over 2a

Answer 6

Okay, for x^2+8x+12=0, what is a, b and c?

Answer 7

Exactly!

Answer 8

x= -2, -6

Answer 9

a=1, b=8, c=12

Answer 10

All you have to do now is plug these numbers in and simplify the fraction :)

Answer 11

go on www.mathway.com for answer.

Answer 12

okay one second @tom982

Answer 13

i don't have to minus 12 or anything?

Answer 14

\[ x= \frac{-b \pm \sqrt{b^2-4ac}}{2a} \]So \[ x= \frac{-8 \pm \sqrt{8^2-4*1*12}}{2*1} \]

Answer 15

That's all you have to simplify :)

Answer 16

...that's the answer?

Answer 17

well, after simplifying it?

Answer 18

yes and you will come out with 2 answers because you add and subtract the square root

Answer 19

got that one :)

Answer 20

can you help me with more if i make another question? i will give more medals :o

Answer 21

yes

Answer 22

2x^2+5x=7

Answer 23

Okay so subtract 7 from both sides to make it equal 0: 2x^2+5x-7=0. Then use a=2, b=5 and c=-7 in the formula :)

Answer 24

after subtracting 7, would it turn into 2x^2+5x-7?

Answer 25

@tom982

Answer 26

Yeah

Answer 27

so now what?

Answer 28

@tom982

Answer 29

What I said before:
"Okay so subtract 7 from both sides to make it equal 0: 2x^2+5x-7=0. Then use a=2, b=5 and c=-7 in the formula :)"

Answer 30

ah okay i forgot to write that it is =0 :p

Answer 31

-5+/- square root 5^-4(2)(7)

Answer 32

42 times 7 = 294?

Answer 33

Be careful of the double negative in the -4ac term:
\[x= \frac{-5 \pm \sqrt{5^2-4*a*(-7)}}{2*2}\]

Answer 34

Oops, left an a in there, it should be 2.

Answer 35

i didn't make the 7 negative before lol

Answer 36

so, -294? @tom982

Answer 37

-4*2*-7=56

Answer 38

i did 5 to the second power before all of that, should i not do that?

Answer 39

\[x= \frac{-5 \pm \sqrt{25+56}}{4}\]

Answer 40

Indices should come first, yes. But I have no idea where you're getting 294 from :p

Answer 41

5*5=25-4=21*2=42+7=294

Answer 42

but you arent supposed to mess with the 5*5 i just figured out

Answer 43

42*7=294 not 42+7 lol sorry

Answer 44

No no, never do that!

Answer 45

now i know :)

Answer 46

Great :) Can you tell me the answer now?