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Baldwin777

  • 3 years ago

2x^2+4x=16 x=?

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  1. pottersheep
    • 3 years ago
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    Rearrange it to become 2x^2+4x - 16 = 0 Then plug it into the formula or factor it

  2. pottersheep
    • 3 years ago
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    You can factor out a 2, see where that gets you..

  3. pottersheep
    • 3 years ago
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    Do you get it?

  4. Baldwin777
    • 3 years ago
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    no,I don't

  5. pottersheep
    • 3 years ago
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    it becomes 2(x^2 + 2x - 8) = 0 when you factor it

  6. pottersheep
    • 3 years ago
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    Can you factor x^2 + 2x - 8 ?

  7. Baldwin777
    • 3 years ago
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    okay let me try this

  8. Baldwin777
    • 3 years ago
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    it would be (x+4)(x-2) right?

  9. pottersheep
    • 3 years ago
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    Do you know the formula? The quadratic formula?

  10. Baldwin777
    • 3 years ago
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    Yes and no, I forgot the steps

  11. pottersheep
    • 3 years ago
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    Nice you factored it right

  12. Baldwin777
    • 3 years ago
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    So then I would plug the x+4 and x-2 into the equation right,? it would be 2(4)^2+4(-2)=16??

  13. pottersheep
    • 3 years ago
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    So 2(x^2 + 2x - 8) = 0 2 (x - 2 ) ( x + 4 ) = 0 NOW, you know how anything times zero = 0? You have to make at least one of the brackets = 0 to get zero as an overall answer. So what can we put as x to make the brackets zero? There is x in two places so there are 2 answers

  14. pottersheep
    • 3 years ago
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    To find the answers, factoring is one way. The formula is another. Yo chose to factor so you dont need to use the formula anymore

  15. Baldwin777
    • 3 years ago
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    2x-2=0 and 2x+4=0

  16. pottersheep
    • 3 years ago
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    You just have to make the brackets = 0, don't put in the two! See we got 2 (x - 2 ) ( x + 4 ) = 0 So, one bracket is (x-2) . We want to make this = 0 x-2 = 0 x = 2 !!! One of the answers.. Next bracket (x+4) Make it equal to zero. x+4 = 0 x= -4 So the answer is x = -4 or x = 2

  17. Baldwin777
    • 3 years ago
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    oh wow, that was really simple, Now I under stand

  18. pottersheep
    • 3 years ago
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    Yay!! :)

  19. Baldwin777
    • 3 years ago
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    Thank u

  20. pottersheep
    • 3 years ago
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    you're welcome

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