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anonymous

  • 5 years ago

2x^2 + 7x = 4 how do i solve this by completing the square?

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  1. anonymous
    • 5 years ago
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    a^2+2ab+b^2

  2. anonymous
    • 5 years ago
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    a=2 find out what b is

  3. anonymous
    • 5 years ago
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    thats not by completing the square tho is it ?

  4. anonymous
    • 5 years ago
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    this method will help you in long term but if you want shortcut I can show you

  5. anonymous
    • 5 years ago
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    would you rather learn shortcut?

  6. anonymous
    • 5 years ago
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    i just want to know the step by step because i have the answers in the back of the book i just cant get the right answers but my math is all correct

  7. anonymous
    • 5 years ago
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    Short cut 1) Factor out 2 2(x^2 + 7/2x) 2) Take Half of x term 7/2 * 1/2 is 7/4 3) Square it 49/16 4) Since you added(49/16 * 2) you also need add to other side 4+49/8

  8. anonymous
    • 5 years ago
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    okay let me write that down

  9. anonymous
    • 5 years ago
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    now what

  10. anonymous
    • 5 years ago
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    You have just completed a square 2(x^2+7/2x+49/16) Factor 2(x+7/4)^2=4+49/8

  11. anonymous
    • 5 years ago
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    Divide both side by 2 then I think you can take it from there

  12. anonymous
    • 5 years ago
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    so it be (4+ 49/8) / 2?

  13. anonymous
    • 5 years ago
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    Yes

  14. anonymous
    • 5 years ago
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    okay i got 5.0625

  15. anonymous
    • 5 years ago
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    thanks!

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spraguer (Moderator)
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