Question

if 2a+3b=7 & ab=2, find 4a² +9b²​

Answer 1

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