Answers

2014-07-10T21:35:31+08:00
x^2 - 5x + k
a = 1; b = -5 ; c = k?
k = (b/2)^2
   = (-5/2)^2
k = 25/4 or
   = 6 \frac{1}{4}
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2014-07-12T11:08:09+08:00
X²-5x+k
x=⁻b+(b₋4ac)
----------------
    2(a)
x=5+√(5²-4(1)(1)
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      2(1)
x=5+√25-4
-------------
      2
x=5+√21
----------------
       2
x=5+11
-----------
     2
x=5+11
-----------
     2
x=15
-------
   2
x₁=7.5
x=5-11
---------
    2
x=⁻6
--------
    2
x₂=⁻3
x₁=7.5 and x₂=⁻3
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