## hot_cutie 3 years ago x2 - 3x = 4 (the 2 is smal)

1. lilg132

x^2 - 3x - 4 = 0 what two numbers added together give you -3 and multiply to give you -4?

2. hot_cutie

A?

3. lilg132

LOL

4. hot_cutie

A) 1 4 B) 1 -4 C) -1 4 D) -1 -4

5. Mimi_x3

Just use wolfram alpha if you are lazy

6. lilg132

i'm not giving you anymore answers if you dont want to learn

7. hot_cutie

i wanna learn just not too good at this lol :)

8. Doman

\[(x-4)(x+1)=0\]

9. lilg132

well stop guessing and try and understand

10. lilg132

what two numbers can i add together to give me -3

11. hot_cutie

1+2

12. lilg132

no that will give you +3 not -3

13. lilg132

-4 + ? BIG CLUE

14. hot_cutie

1-2?

15. lilg132

that will give you -1

16. hot_cutie

1+2-6?

17. lilg132

i said two numbers

18. lilg132

not three

19. hot_cutie

0-3?

20. lilg132

try taking a look at where i said BIG CLUE !

21. lilg132

22. lilg132

that would give you -3 but we need to find two numbers that give you -3 and the same two numbers need to multiply to give you -4

23. hot_cutie

plz i only have 10 minutes left

24. lilg132

its touching if you want to learn you will make more time

25. hot_cutie

plz i want to learn but just dont have time right now

26. neverforgetvivistee

ok so you have x2 - 3x = 4 the first thing you want to do is equal this to zero, we can do that by subtracting 4 x^2-3x-4=0 Now, like what that person said, what can you multiply to get -4, and add to get -3? now let's guess and check. 1 * 4 = 4, but 1 + 4 = 5, ew that won't work hmm. 1 * -4 = -4, and 1 - 4 = -3 that works! now we use these two numbers, 1 and -4 and plug it back into the original equation (take the -3x away) x^2+1x-4x-4 basically what we did is split the -3 apart, because you see, 1x-4x equals -3x so it's basically the same thing, but the point of doing this is that you can factor by grouping. so lets group the first two terms, x^2 and 1x, what two numbers, or variables, go into both of these? well, x does. x Now what's x divided by x^2? that's just x x ( x now what's x divided by 1x? 1. x ( x +1 ) you know this is correct when you use the distributive propetry and get what you use to have|dw:1323571839146:dw| now, let's factor the other two terms, -4x and -4 these look like they both go into -4 -4 now, -4x divided by 4? just x. -4 ( x -4 divided by -4? 1. -4 (x+1) Now, lets bring it all together. the numbers in the parentheses should be the same (you got x+1 in both, so it's right. (x+1) now let's bring over the numbers that aren't in parentheses x and -4 just put those in parentheses like (x-4) the factored version is (x+1)(x-4) now, we have to equal both of these to zero and solve like a regular algebra problem to get your two solutions x+1=0 subtract 1 from both sides x=-1 do the same thing to the other one x-4=0 add 4 to both sides x=4 those are your two solutions x=-1 and x=4

27. neverforgetvivistee

if you don't understand something tell me

28. hot_cutie

29. neverforgetvivistee

c

30. neverforgetvivistee

i just typed it above

31. hot_cutie

thanx hun that worked :) <3

32. moneybird

That's a miracle <3

33. neverforgetvivistee

well didn't you read what i wrote?

34. moneybird

Well, all she cares is the letter

35. lilg132

no you just wasted your time neverforgetvivistee

36. neverforgetvivistee

well flutter

37. neverforgetvivistee

flutter come on

38. hot_cutie

big kisses hun, thanx :)

39. neverforgetvivistee

i put real thought into that

40. neverforgetvivistee

flutter you hot cutie u stupid feather

41. lilg132

i've been trying for a while as well now but she just doesnt want to learn she doesn't have 'time' to learn apperently

42. moneybird

She doesn't even understand the very basic of algebra.