Question
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Answer (Detailed Solution Below)
Option 1 : 1.8 / 1.8
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Detailed Solution
सही उत्तर 1.8 / 1.8 है।
Key Points
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prepsnap.in • Part -AQuestion:
Evaluate: $\frac{(3.9)^3 - (2.1)^3}{(3.9)^2 + 3.9 \times 2.1 + (2.1)^2}$. / मान ज्ञात कीजिए: $\frac{(3.9)^3 - (2.1)^3}{(3.9)^2 + 3.9 \times 2.1 + (2.1)^2}$।
1.
1.8 / 1.8
2.
6.0 / 6.0
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3.9 / 3.9
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2.1 / 2.1
Correct Answer: 1.8 / 1.8
Using $p^3-q^3 = (p-q)(p^2+pq+q^2)$, the expression equals $p - q = 3.9 - 2.1 = 1.8$. / $p^3-q^3 = (p-q)(p^2+pq+q^2)$ के प्रयोग से व्यंजक $= p - q = 3.9 - 2.1 = 1.8$।
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