Question

Question 13 (Multiple Choice Worth 5 points)

[9.05] What are the exact solutions of x2 − x − 4 = 0?

x = the quantity of negative 1 plus or minus the square root of 15 all over 2

x = the quantity of 1 plus or minus the square root of 15 all over 2

x = the quantity of 1 plus or minus the square root of 17 all over 2

x = the quantity of negative 1 plus or minus the square root of 17 all over 2

Answer 1

lol ;)

Answer 2

I think it be D but its not right to me can you help me

Answer 3

so, lets use the difference of squares method (also know as the pathagorian therom) to solve this.

Answer 4

\[(-b +or- \sqrt{b^2-4*ac})/2a\]

Answer 5

whats next

Answer 6

so the equation us have has the form a^2-b-c=0

Answer 7

sooo....\[-1+or-(\sqrt{-1^2-4*1*-4})/2*1\]

Answer 8

I don't know how to do this sorry

Answer 9

solve for -1^2-4*1*-4 first...k

Answer 10

I am lost sorry

Answer 11

okay sorry... what does -1^2*4*1*-4=?

Answer 12

opps I meant -1^2-4*1*-4=?

Answer 13

how do i solve for that

Answer 14

-1^2=1 right-4*1which is -4*-4 which =16...so ur left with 17 right?

Answer 15

yea

Answer 16

-1^2 means negative one to the second power. you know that ya?

Answer 17

2 right

Answer 18

-1x -1 = -1^2 = 1

Answer 19

oh ok

Answer 20

k

Answer 21

so the answer is C right

Answer 22

YOUUUUUU GOT IT... NICE JOB.

Answer 23

cool one more thing can you help me on this Question 14 (Multiple Choice Worth 5 points)

[9.05] What are the approximate solutions of 2x2 − 7x = 3 rounded to the nearest hundredth?

No real solutions

x ≈ −0.77 and x ≈ 7.77

x ≈ −0.39 and x ≈ 3.89

x ≈ −3.89 and x ≈ 0.39

Answer 24

I think its A but not sure lol

Answer 25

k..use the pathagorian therom to solve this one too..but u will need a calc for this one

Answer 26

the 3 on the right side of the equation is confusing u hu?

Answer 27

yea

Answer 28

will it B

Answer 29

so just subtract 3 from both sides so that the right side is equal to 0... like this \[2x^2-7x-3=3-3 -> 2x^2-7x-3=0\] see,

Answer 30

now put it in your calc \[-1*-7 +or- (\sqrt{-7^2-4*2*-3})/2*2\]