Question

Decide which part of the quadratic formula tells you whether the quadratic equation can be solved by factoring.

−b b2 − 4ac 2a

Use the part of the quadratic formula that you chose above and find its value given the following quadratic equation:

2x2 + 7x + 3 = 0

Answer 1

b^2-4ac i guess :)

Answer 2

b^2 - 4ac definitely. No need for guessing here. This is called the discriminant and will be the portion under the radical. If it is positive and gives a perfect square, then you can solve by factoring.

Answer 3

thanks guys

Answer 4

but i also have to solve it can u help me there also??

Answer 5

Here

a=2

b=7

and

c=3

Answer 6

\[\frac{ -b \pm \sqrt{b ^{2} - 4ac} }{ 2a }\]That is your solution for "x" for equations of the form:

ax^2 + bx + c = 0

which is what you have:

2x^2 + 7x + 3 = 0

so, a=2, b=7, and c=3

So, just substitute, and yes, this one can be solved by factoring, but you can also use the quadratic formula as presented here.

Answer 7

How's this going for you now with this detailed explanation?

Answer 8

Having a hard time getting started?

Answer 9

srry was afk

Answer 10

-7+/7^2 -4*2*3
-------------
2 * 2

-7 +/ 49 + 16
------------
4

Answer 11

-7-/7^2 -4*2*3
-------------
2 * 2

-7 -/ 49 + 16
------------
4

Answer 12

are those right? so far

Answer 13

No, arithmetic errors:

-4*2*3 is not equal to 16

Answer 14

Think of -4*2*3 as (-4)*(2)*(3)

and

(-a)(b) = -ab

example:

(-6) * (8) = -(6) * (8) = -48

Answer 15

sorry im confused because ive done these before i just kinda forgot but when u showed me the first way to solve them i remember but this last part confused me

Answer 16

Your confusion should be cleared up if you read my posts and do the substitutions and do the work. Start with my corrections to your work. If you really are having trouble multiplying a negative number by a positive number, then I cannot help you. I could give you the final answer, but that will not help you in the slightest. Not at all. The goal is for you to be able to do these on your own and you now have all the explanation I can give you. Good luck.

Answer 17

btw can u read this that way when i get the answer u can help me with a way of putting my answer in.

Answer 18

For Fill in the blank items, you may type in any digits between 0 and 9, – for a negative sign, / for a fraction bar, or a decimal point. Do NOT type in commas, dollar signs, percent signs, variables, or spaces. If there are extra spaces at the end of your answer, the computer will mark that problem incorrect

Answer 19

so the -4 * 2 * 3 would be -24?

Answer 20

yes

Answer 21

ok so
-7+/7^2 -4*2*3
-------------
2 * 2

-7 +/ 49 + 24
------------
4
---------------------------------------------
-7-/7^2 -4*2*3
-------------
2 * 2

-7 -/ 49 + 16
------------
4

Answer 22

-7-/7^2 -4*2*3
-------------
2 * 2

-7 -/ 49 + 24
------------
4

Answer 23

7^2 -4*2*3 is not equal to 49 + 24

You already corrected your work on -4 * 2 * 3 to be equal to -24

Answer 24

srry i see now that i forgot the negative

Answer 25

np. just make the correction and continue. You're starting to get this now. You're doing fine, just keep up the good work.

Answer 26

ok

Answer 27

so 49 + -24 = 25
25 SR = 5
-7 + 5 = -2
-- = 0.5
4

Answer 28

-2/4 is not equal to 0.5

Answer 29

and 49 + -24 = 25
25 sr = 5
-7 - 5 = -12
-- = -3
4

Answer 30

srry -2

Answer 31

-3 is correct, but 0.5 is not. So, you have half of your answer so far.

Answer 32

-2

Answer 33

(x + 1/2)(x + 3) = (2x + 1)(x + 3) = 0 = 2x^2 + 7x + 3

Answer 34

That's your factored answer.

Answer 35

0.o

Answer 36

You're welcome. Good luck to you in all of your studies.

Answer 37

thanks

Answer 38

thx for the recognition! @Vince34

Answer 39

np

Answer 40

daang 3 years ago