3a(3a+2b)-(a+b)²= 9a²+6ab-a²-2ab-b²= 8a²+4ab-b²
3a(3a + 2b) - (a + b) =
= 9a² + 6ab - (a² + 2ab + b²) =
= 9a² + 6ab - a² - 2ab - b² =
8a2 + 4 ab - b2
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3a(3a+2b)-(a+b)²= 9a²+6ab-a²-2ab-b²= 8a²+4ab-b²
Verified answer
3a(3a + 2b) - (a + b) =
= 9a² + 6ab - (a² + 2ab + b²) =
= 9a² + 6ab - a² - 2ab - b² =
8a2 + 4 ab - b2