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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