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anonymous

  • one year ago

Using the completing-the-square method, rewrite f(x) = x2 − 8x + 3 in vertex form. f(x) = (x − 8)^2 f(x) = (x − 4)^2 − 13 f(x) = (x − 4)^2 + 3 f(x) = (x − 4)^2 + 16

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  1. MrNood
    • one year ago
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    well - you could expand all the answers and see which is the same as the original equation - but that is the long way round. Look at the brackets which are all 'squared' look at teh constant term (e.g. -8 in the first example) when you square brackets you will always get the square of that value as a constant so again in the first example you will get +64 as the constant when you expand now - you can see that that is NOT the same as the original (the constant is +3 in the original) So - go throught the answers and work out the resultant of the CONSTANT terms only. Only one of them works out to be +3 so that must be the answer

  2. anonymous
    • one year ago
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    Then wouln't it be the second one?

  3. MrNood
    • one year ago
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    :-)

  4. MrNood
    • one year ago
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    However - that is a quick 'cheat' given that itis a multichoice question. To really complete your understanding you should use the 'compete the square' method as required by the question - if you didn't have the multichoice you would have to do that...

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