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anonymous

  • 4 years ago

identify the solutions to the equation when you solve by completing the square

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  1. anonymous
    • 4 years ago
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    |dw:1327792510736:dw|

  2. anonymous
    • 4 years ago
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    4x^2- 20X+25= 0 Make two sets of parenthesis. because x is squared, x will be the start of both parenthesis (x ) (x ). it's either 4, 1 or 2, 2 for before the X's. ( one number for each, using the fact tree idea) .. continuing

  3. anonymous
    • 4 years ago
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    guessing which goes where is the fight next. if (2x- ) (2x+ ) then that would = 4x^2 the "outers" are next. the last two "outers have to be multiplied to get 25, but add up to the 20.

  4. anonymous
    • 4 years ago
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    so, the factors of 25 are ( 1,5, 25) any others?

  5. anonymous
    • 4 years ago
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    ok, so it looks like 2 and 2 won't work. try 4 and 1 (4x-5) (x+5). = 4x^2 +20x- 5x-25= 4x^2+15X-25 This is close!! Now we need to change the signs in the middle, they don't work.

  6. anonymous
    • 4 years ago
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    options are a. -2.5, 2.5 b.2.5 c.-2.5 d.no real solutions

  7. anonymous
    • 4 years ago
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    (4x-5) (x-5) =4x^2-20x-5x+25= 0 4x^2-25x=-25 Wish I had known you HAVE the answers.. You just needed to plug them in to see if they work!! lol But now you can see how to work through the problem... Enjoy!

  8. anonymous
    • 4 years ago
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    what is the answer?

  9. anonymous
    • 4 years ago
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    How old are you? Have you done this before? in school?

  10. anonymous
    • 4 years ago
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    PLug in the numbers ( choices) as X and see if they work.

  11. anonymous
    • 4 years ago
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    thanks!! i got it

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spraguer (Moderator)
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