Question

Which of the following is a solution of x2 - 7x = -5?
7 plus or minus the square root of 69 divided by two
7 plus or minus the square root of 29 divided by two.
negative 7 plus or minus the square root of 29 divided by two
negative 7 plus or minus the square root of 69 divided by two.

Answer 1

Do you know how to factor or use the quadratic formula

Answer 2

I'm terrible at factoring

Answer 3

7 plus or minus the square root of 29 divided by two

Answer 4

Is the answer :)

Answer 5

\[x^2-7x=-5\\
x^2-7x+5=0 ~This~ is~from~adding~5~ to~both~sides~\]

Answer 6

Please dont give out just the answer, this is a site for learning

Answer 7

Do I always have to add or subtract something to the other side, or just in this case?

Answer 8

@dan815 If she's interested in learning how I got the answer, I'll share.

Answer 9

@beamarie With quadratic equations, you need to factor like Dan was saying

Answer 10

that should be all over 2a

Answer 11

For the part where you put ax + bx + c = 0 do I have to plug everything in there first and then put it into the quadratic formula, or just use the numbers 1, -7, and 5?

Answer 12

\[x= \frac{-b+\sqrt{b^2-4ac}}{2a}\\
x= \frac{-b-\sqrt{b^2-4ac}}{2a}\]

Answer 13

just the numbers

Answer 14

Okay, let me try it

Answer 15

If you want a way to do this without the formula, let me know! I can show you how to complete the square, or you can simply google how to compete the square

Answer 16

No the quadratic formula is much easier, thank you for your help!
and thanks @Chancerz for trying to help as well!

Answer 17

@dan815 quick question, how do I know if its a positive or negative in the beginning?