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Question

(5a+2/3)² - (2a-1/3)²

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Solution

( 5a - 2/3 ) ² - ( 2a - 1/3 ) ²

= 25a² + 4/9 - 20a/3 - ( 4a² + 1/9 - 4a/3 )

= 25a² + 4/9 - 20a/3 - 4a² - 1/9 + 4a/3

= 21a² + 3/9 - 16a/3

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