Saved Bookmarks
| 1. |
Find the changes of sign of the following expressions and find extreme values i) 15+4x-3x^(2) ii) 4x-5x^(2)+2 |
|
Answer» 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. |
|