Question

expand 9a square-4b square by using suitable identity​

Answer 1

$Expansion \: of \: 9a^{2} - 4b^{2}$

$= (3a)^{2} - (2b)^{2}$

/* By algebraic identity */

$\boxed{\pink{ x^{2} - y^{2} = (x+y)(x-y) }}$

$= ( 3a + 2b )( 3a - 2b )$

Therefore.,

$\red{Expansion \: of \: 9a^{2} - 4b^{2}}$

$\green { = ( 3a + 2b )( 3a - 2b ) }$

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