Question

Expand: (3a + b)² 
Please help
No useless answers
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Answer 1

Answer:

(3a)² + (b)² +2×3a×b

9a²+b²+6ab

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Answer 2

Answer:

$9a^2 + 6ab + b^2$

Step-by-step explanation:

$= ( 3a + b )( 3a + b ) \\ \\ </p><p></p><p>= ( 9a^2 + 3ab ) +( 3ab + b^2 ) \\ \\ </p><p></p><p>= 9a^2 + 3ab + 3ab + b^2 \\ \\ </p><p></p><p>= 9a^2 + 6ab + b^2$