find the maximum and minimum value of the quadratic expression 2x -7- 5x2
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When we find the maximum value and the minimum value of ax^2 + bx + c then let us assume y = ax^2 + bx + c. Thus, the minimum value of theexpression is 4ac - b^2/4a. Therefore, we clearly see that the expression y becomes maximum when a < 0. Thus, the maximum value of the expressionis 4ac - b^2/4a.
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