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hot_cutie

  • 3 years ago

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

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

  2. hot_cutie
    • 3 years ago
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    A?

  3. lilg132
    • 3 years ago
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    LOL

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

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

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

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

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

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

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

  11. hot_cutie
    • 3 years ago
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    1+2

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

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

  14. hot_cutie
    • 3 years ago
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    1-2?

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

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

  17. lilg132
    • 3 years ago
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    i said two numbers

  18. lilg132
    • 3 years ago
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    not three

  19. hot_cutie
    • 3 years ago
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    0-3?

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

  21. lilg132
    • 3 years ago
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    good your getting there

  22. lilg132
    • 3 years ago
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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

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

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

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

  26. neverforgetvivistee
    • 3 years ago
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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

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

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

  29. neverforgetvivistee
    • 3 years ago
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    c

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

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

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

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

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

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

  36. neverforgetvivistee
    • 3 years ago
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    well flutter

  37. neverforgetvivistee
    • 3 years ago
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    flutter come on

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

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

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

  41. lilg132
    • 3 years ago
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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

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

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