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Find the changes of sign of the following expressions and find extreme values i) 15+4x-3x^(2) ii) 4x-5x^(2)+2

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Answer :i) If `-(5)/(3) lt X lt 3`, the expression is positive.
If `x lt -(5)/(3)` or `x GT 3`, the expression is NEGATIVE.
The extreme value is `(49)/(3)`. ii) If `(2-sqrt(14))/(5) lt x lt (2+sqrt(14))/(5)` the expression is positive.
`x lt (2-sqrt(14))/(5)` or `x gt (2+sqrt(14))/(5)` the expression is negative.


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