Question

2. Find the maximum or minimum value of the expression 2x - 7-5x?
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Answer 1

Answer:

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.

its the answer.......