Saved Bookmarks
| 1. |
A+b+c=10,a²+b²+c²=22 हो तो ab+bc+ca का मान क्या होगा solve step by sstep |
|
Answer» ab+bc+ca = 39 Step-by-step explanation:
a+b+c = 10 => (a+b+c)² = 100 => a²+b²+c²+2ab+2bc+2ca = 100 => 22+2(ab+bc+ca) = 100 => 2(ab+bc+ca) = 100-22 => 2(ab+bc+ca) = 78 => ab+bc+ca = 78/2 => ab+bc+ca = 39 using FORMULA : (x+y+z)² = x²+y²+z²+2xy+2yz+2zx |
|