Saved Bookmarks
| 1. |
If 2a+3b=7 & ab=2, find 4a² +9b² |
|
Answer» Answer: 25 Step-by-step explanation: (2a+ 3b)² = 4a² +9b² + 2 ×2a×3b (7)² = 4a² +9b² +12ab 49 = 4a² +9b² +12×2 49 = 4a² +9b² + 24 4a² +9b² = 49 -24 = 25 |
|