Question

How do i solve
c^2 - 14c + 40

Answer 1

factor:
(c-4)(c-10)
you can't solve anything because you have no = sign

Answer 2

if it is equal to 0, you can use quadratic formula

Answer 3

or factor like turing mentioned

Answer 4

no quadratic necessary here

Answer 5

use common algebra..

Answer 6

depends on what method his instructor is asking him to use.

Answer 7

c=10 and c=4

Answer 8

ok how did u get (c-4)(c-10)

Answer 9

Pick two numbers that multiply to 40 and add to -14

Answer 10

people is simple, c=10 and c=4

Answer 11

Xavier's way is the same method I use, but there is a more mechanical way too. I've forgotten it though

Answer 12

@fontez, yes we all know the answer, we are trying to TEACH how to find it though.

Answer 13

besides, as I said earlier there is no answer to this problem b/c there is no equal sign

Answer 14

you just assumed it was =0
not always a good assumption

Answer 15

Completing the square was a mechanical method

Answer 16

yeah I hate doing that

Answer 17

resolves formule
a=1
b=-14
c=40
ok?

c=-b\[\sqrt{b ^{2}-4ac} /2a\]

Answer 18

(above note) c=-b+...

Answer 19

again, you assumed this is equal to zero.
You can't just do that if you want to be a good mathematician

Answer 20

undersand turintest?

Answer 21

resolvent formula, only ;)

Answer 22

no I don't "undersand" LOL

Answer 23

really?

Answer 24

yes, I don't understand why you think you can just give out answers with no explanation, and then try to explain your method using a completely unfounded assumption. I see why you thicnk it is obvious that the questioner meant that this expression =0, but you need to explain it so they understand how these problems work. I don't understand how you think you are helping people this way.

Answer 25

what? study TuringTest, study.

Answer 26

?

Answer 27

i no explain calculate c?

Answer 28

are you implying that I don't understand what you tried to do? Do you think I don't know the quadratic formula. I believe it is you who does not understand what I am saying. I've had enough of this conversation, I have other students to help. Work on your English. Goodbye.

Answer 29

sorry Turing, i am portuguese and not english ;) and i not implying ;)

Answer 30

then you are forgiven. I don't mean to insult you, I am trying to explain why you cannot assume that this expression is equal to 0. that is all

Answer 31

fine.

Answer 32

turing help me please.
ABCD is a square of side 1. His hand was extended and a BD line AF has been linked to the end of extra time DF. Since EF = 1, calculate x.

Answer 33

people?

Answer 34

I'm looking at it...

Answer 35

By the picture alone I don't think I can solve it (I'm not even sure it's solvable) and the information you provided is difficult to understand because it is worded strangely. I understand this is probably because English is not your primary language.

Anyway, I suggest reposting the question, and look for people like Harkirat, JamesJ, amistre, myininaya, and zarkon. they are some of the best here and may be able to help you. I have to go anyway, so sorry, but good luck.

Answer 36

thanks, but i resolves, but thanks ;) is very simple :(

Answer 37

lol in just confused now.