(3x + 4y)(3x + 5y)=(3x)2 + [(4y)+(5y)] 3x + [(4y)×(5y)]{ ∵(x + a)(x + b)= x2 +(a + b)x +(a × b)}= 9x2 + [(9y)×(3x)] + 20y2= 9x2 + 27xy + 20y2

Q. 1 E4.4( 17 Votes )

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Answer :

(3x + 4y)(3x + 5y)=(3x)² + [(4y)+(5y)] 3x + [(4y)×(5y)]

{ ∵(x + a)(x + b)= x² +(a + b)x +(a × b)}

= 9x² + [(9y)×(3x)] + 20y²

= 9x² + 27xy + 20y²

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