Answer:
(2a + 3b)² = 121
Explanation:
given 4a² + 9b² = 25 and ab = 8
(2a + 3b)² ← expand using FOIL
= 4a² + 6ab + 6ab + 9b²
= 4a² + 9b² + 12ab ← substitute given values from above
= 25 + 12(8)
= 25 + 96
= 121
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