Question

Solve. x2 - 2x = 3.

Answer 1

Any ideas?

Answer 2

$$\Huge x^2 - 2x = 3$$

Answer 3

would you set it to 0

Answer 4

Sort of. But the idea is to subtract 3 from both sides first.

Answer 5

oh

Answer 6

$$\Huge x^2 - 2x - 3=0$$

Answer 7

what would you do next

Answer 8

Factor the left hand side.

Answer 9

gcf?

Answer 10

im lost

Answer 11

Nope, not the gcf.

Look for two factors of -3 that have opposite signs and add up to -2.

Answer 12

oh yeah i knda remember now..... -3,1

Answer 13

Yes, so the factorization will look like $$\Huge(x-3)(x+1)=0$$

Answer 14

the answer is -3,1?

Answer 15

No the answer is not -3, 1.

What values of x will make this equation true?

Answer 16

x=-3 x=1? idk

Answer 17

what is zero times any number?

Answer 18

0

Answer 19

what value of x in x - 3 will make it 0?

Answer 20

0?

Answer 21

is 0 - 3 = 0?

Answer 22

no

Answer 23

if x = 3 then x - 3 becomes 3 - 3 = 0

Answer 24

ohh i see

Answer 25

and if x = -1 the other factor becomes 0

Answer 26

So the solution set is {3, -1}

Answer 27

thank you ,, ive got another question

Answer 28

well its not really a math question

Answer 29

ive got a final coming up this week thats worth 275(20%) ...it has 36 multiple choice and 4 free response.. i have to get a 60% on the final or i dont get credit for the class. how many questions do you think i would have to get right to get a 60%

Answer 30

You need to get at least 24 question right.

Answer 31

oh , im screwed

Answer 32

thanks

Answer 33

thanks for asking :)