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At what values of x in R the following q...

At what values of `x in R` the following quadratic expressions have maximum or minimum values
i) `x^(2)+5x+6` ii) `2x-x^(2)+7`

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The correct Answer is:
i) The expression has absolute minimum at `x=(-5)/(2)` ii) The expression has absolute maximum value at x=1
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