182755
182755 182755
  • 14-12-2017
  • Mathematics
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Is 2x + y2=5 a function?

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fangirl2134 fangirl2134
  • 14-12-2017
y=x2−4x−5=(x2−4x+4)−9=(x−2)2−9y=x2−4x−5=(x2−4x+4)−9=(x−2)2−9, now as (x−2)2≥0(x−2)2≥0 (so min value is 0) then the minimum value of the function is 0-9=-9.
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