Question

Multiply (a^2+2b^2) and (5a-b)

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Answer 1

$\huge\boxed{\red{\bf \green{\dag} Solution }}$

= (a² + b² ) ( 5a - b )

= 5a ( a² + b² ) - b ( a² + b² )

= 5a³ + 5ab² - ab² - b³

= 5a³ + 4ab² - b³.