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  1. The maximum value of 5 + 20x – 4x2 , when x is a real number is :
    1. 1
    2. 5
    3. 25
    4. 30
Correct Option: D

For y = ax2 + bx + c

Maximum value = c –
b2
4a

Here, c = 5, b = 20, a = –4
∴ Maximum value = 5 –
20 × 20
 = 5 + 5 × 5 = 30
4 × −4


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