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Verified answer
8a² - 8b² + 15a² + 20b²8a² + 15a² - 8b² + 20b²
23a² + 12b²
Verified answer
8(A²-B²)+5(3A²+4B²)= (8 . A²) - (8 . B²) + (5 . 3A²) + (5 . 4B²)
= 8A² - 8B² + 15A² + 20B²
= 8A² + 15A² - 8B² + 20B²
= (8 + 15)A² + (-8 + 20)B²
= 23A² + 12B²