उस अंतराल को ज्ञात कीजिए जिसमें फलन f(x) = 2x2 - 3x निरंतर वर्धमान फलन है?

  1. (\(\rm\frac{3}{4}\), ∞)
  2. [\(\rm\frac{-3}{4}\), ∞)
  3. (-∞ ,\(\rm\frac{3}{4}\)]
  4. [\(\rm\frac{3}{4}\), 1)
    duplicate options found. English Question 1 options 1,2

Answer (Detailed Solution Below)

Option 1 : (\(\rm\frac{3}{4}\), ∞)
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संकल्पना:

यदि प्रत्येक बिंदु पर f′(x) > 0 एक अंतराल में है तो फलन को निरंतर वर्धमान फलन कहा जाता है।
 

गणना:

दिया गया है कि , f(x) = 2x2 - 3x 

अवकलन करने पर, हमें निम्न प्राप्त होता है 

f'(x) = 4x - 3

f(x) निरंतर वर्धमान फलन है

∴ f'(x) > 0

⇒ 4x - 3 > 0

⇒ 4x > 3 

⇒ x > \(\rm\frac{3}{4}\)

∴ x ∈ (\(\rm\frac{3}{4}\), ∞)

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