a+b+c=9 এবং ab + bc + ca =26 হলে এর মান কত?
Created: 5 years ago |
Updated: 3 years ago
best des
a + b + c = 9,
ab + bc + ca = 26,
a² + b² + c² = ?
(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)
বা, a² + b² + c² = (a + b + c)² - 2(ab + bc + ca)
= 9² - (2×26)
= 81 - 52
= 29
Md Azizur Rahman
Founder of Satt
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