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यदि x + y + z = 0 हो, तो दिखाइए कि x3 + y3 + z3 = 3xyz है। - Mathematics (गणित)

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Question

यदि x + y + z = 0 हो, तो दिखाइए कि x3 + y3 + z3 = 3xyz है।

Sum

Solution

चूँकि, x + y + z = 0

= x + y = −z(x + y)3 = (−z)3

= x3 + y3 + 3xy(x + y) = (−z)3

= x3 + y3 + 3xy(−z) = −z3        ...[∵ x + y = −z]

= x3 + y3 − 3xyz = (−z)3

= x3 + y3 + z3 = 3xyz

अतः यदि x + y + z = 0, तब

x3 + y3 + z3 = 3xyz

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बीजीय सर्वसमिकाएँ
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Chapter 2: बहुपद - प्रश्नावली 2.5 [Page 58]

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NCERT Mathematics [Hindi] Class 9
Chapter 2 बहुपद
प्रश्नावली 2.5 | Q 13. | Page 58
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