Question
Factorise $: 25a^2- 9b^2$
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Answer
$25a^2- 9b^2$
$= ( 5a )^2 - ( 3b )^2$
$= ( 5a - 3b )( 5a + 3b )$
$= ( 5a )^2 - ( 3b )^2$
$= ( 5a - 3b )( 5a + 3b )$
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