Question

PLEASE HELP ALGEBRA 2!

What is a solution of x^2 - 7x = -5?

Answer 1

Make it a quadratic so

x^2-7x+5=0

Answer 2

Do you know how to solve these?

Answer 3

Nope. But I have to submit this in 2 minutes so I have to hurry :/

Answer 4

well luckily for you this one is unfactorable so you have to complete the square or quadratic formula..

Answer 5

let me do it on paper..

Answer 6

Ok...

Answer 7

is this really due in 2 minutes ??

Answer 8

Yep. Actually 1 minute now...

Answer 9

Well now the time is up :/

Answer 10

Sorry...do you still want the answer to know how to do this?

Answer 11

Yes please.

Answer 12

Ok, let me write it out for you

Answer 13

Thanks.

Answer 14

x^2-7x+5=0

since it is unfactorable, you must complete the square.

1.subtract c value to both sides (5)

you get

x^2-7x=-5

To get a new c value that factorable, you use the formula

(b/2)^2

-7/2=3.5^2=12.25

add that to both sides and you get:

x^2-7x+12.25=7.25

factor the trinomial

which would be (x-7/2)^2=7.25

take out the square by making it

x-7/2=the square root of 7.25

add the -7/2 to the other side to get

Answer 15

\[x= \frac{ 7 }{ 2 }\pm \sqrt{29/4}\]

Answer 16

@vera_ewing

Answer 17

I don't know if you ever did this before, but it might be a pain to understand (it took forever for me to get )

Answer 18

Ok that all makes sense but what would be the answer?

Answer 19

the equation i just posted ^^

Answer 20

But that isn't one of my answer choices...

Answer 21

Post your answer choices

Answer 22

https://lss.brainhoney.com/Resource/22181721,AB4,0,B,0,0/Assets/71814_53b5a586/03_07_05a_1.gif

Answer 23

https://lss.brainhoney.com/Resource/22181721,AB4,0,B,0,0/Assets/71814_53b5a586/03_07_05a_2.gif

Answer 24

https://lss.brainhoney.com/Resource/22181721,AB4,0,B,0,0/Assets/71814_53b5a586/03_07_05a_3.gif

Answer 25

https://lss.brainhoney.com/Resource/22181721,AB4,0,B,0,0/Assets/71814_53b5a586/03_07_05a_4.gif

Answer 26

Those are all of my answer choices ^

Answer 27

It looks like they used the quadratic formula instead of completing the square, let me try with the quadratic formula.

Answer 28

Ok

Answer 29

If you use quadratic formula

your final answer would be the second link you posted.

Answer 30

Thank you so much. I really appreciate your help :)

Answer 31

Both completing the square and quadratic formula work, so both my answers are theoretically correct, but in this case they used the quadratic formula...which is actually a billion times easier in this case. My bad.

Answer 32

That's alright :) thanks for taking the time to do it both ways!

Answer 33

No problem, feel free to tag me into any more questions you may have :)