Question

Please help me i don’t even know where to start!

Answer 1

Answer:

b² + c² = 47

Step-by-step explanation:

Expand (b + c)² = 61

⇒   (b + c)(b + c) = 61

⇒  b² + 2bc + c² = 61

Substitute bc = 7 into b² + 2bc + c² = 61:

                                   b² + 2(7) + c² = 61

                                     b² + 14 + c² = 61

To determine b² + c² simply subtract 14 from both sides of the equation:

b² + c² = 47