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hot_cutie

x2 - 3x = 4 (the 2 is smal)

  • 2 years ago
  • 2 years ago

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  1. lilg132
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    x^2 - 3x - 4 = 0 what two numbers added together give you -3 and multiply to give you -4?

    • 2 years ago
  2. hot_cutie
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    A?

    • 2 years ago
  3. lilg132
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    LOL

    • 2 years ago
  4. hot_cutie
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    A) 1 4 B) 1 -4 C) -1 4 D) -1 -4

    • 2 years ago
  5. Mimi_x3
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    Just use wolfram alpha if you are lazy

    • 2 years ago
  6. lilg132
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    i'm not giving you anymore answers if you dont want to learn

    • 2 years ago
  7. hot_cutie
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    i wanna learn just not too good at this lol :)

    • 2 years ago
  8. Doman
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    \[(x-4)(x+1)=0\]

    • 2 years ago
  9. lilg132
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    well stop guessing and try and understand

    • 2 years ago
  10. lilg132
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    what two numbers can i add together to give me -3

    • 2 years ago
  11. hot_cutie
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    1+2

    • 2 years ago
  12. lilg132
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    no that will give you +3 not -3

    • 2 years ago
  13. lilg132
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    -4 + ? BIG CLUE

    • 2 years ago
  14. hot_cutie
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    1-2?

    • 2 years ago
  15. lilg132
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    that will give you -1

    • 2 years ago
  16. hot_cutie
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    1+2-6?

    • 2 years ago
  17. lilg132
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    i said two numbers

    • 2 years ago
  18. lilg132
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    not three

    • 2 years ago
  19. hot_cutie
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    0-3?

    • 2 years ago
  20. lilg132
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    try taking a look at where i said BIG CLUE !

    • 2 years ago
  21. lilg132
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    good your getting there

    • 2 years ago
  22. lilg132
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    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

    • 2 years ago
  23. hot_cutie
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    plz i only have 10 minutes left

    • 2 years ago
  24. lilg132
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    its touching if you want to learn you will make more time

    • 2 years ago
  25. hot_cutie
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    plz i want to learn but just dont have time right now

    • 2 years ago
  26. neverforgetvivistee
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    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

    • 2 years ago
  27. neverforgetvivistee
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    if you don't understand something tell me

    • 2 years ago
  28. hot_cutie
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    so what letter is answer?

    • 2 years ago
  29. neverforgetvivistee
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    c

    • 2 years ago
  30. neverforgetvivistee
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    i just typed it above

    • 2 years ago
  31. hot_cutie
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    thanx hun that worked :) <3

    • 2 years ago
  32. moneybird
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    That's a miracle <3

    • 2 years ago
  33. neverforgetvivistee
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    well didn't you read what i wrote?

    • 2 years ago
  34. moneybird
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    Well, all she cares is the letter

    • 2 years ago
  35. lilg132
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    no you just wasted your time neverforgetvivistee

    • 2 years ago
  36. neverforgetvivistee
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    well flutter

    • 2 years ago
  37. neverforgetvivistee
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    flutter come on

    • 2 years ago
  38. hot_cutie
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    big kisses hun, thanx :)

    • 2 years ago
  39. neverforgetvivistee
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    i put real thought into that

    • 2 years ago
  40. neverforgetvivistee
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    flutter you hot cutie u stupid feather

    • 2 years ago
  41. lilg132
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    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

    • 2 years ago
  42. moneybird
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    She doesn't even understand the very basic of algebra.

    • 2 years ago
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