Teaching DSSSB PGT Mock Test 2025 Mathematics Relations and Functions

a के मानों के कौन से समूह के लिए फलन f(x) = x2 + ax + 1 , [1, 2] पर बढ़ता हुआ फलन है?

1

[4, ∞)

2

[5, ∞]

3

[-4,∞)

4

[-5,∞]

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