(3x + 5y) (5x – 7y) = ……………………A) 15x2 – 3y2 B) 15

1.	(3x + 5y) (5x – 7y) = ……………………A) 15x2 – 3y2 B) 15x2 + 4xy – 35y2 C) 15x2 – 4xy D) 15x – 13xy2
Answer» B) 15x² + 4xy – 35y² Correct option is (B) 15x² + 4xy – 35y² (3x + 5y) (5x – 7y) \(=15x^2-21xy+25xy–35y^2\) = \(15x^2+4xy–35y^2\)

(3x + 5y) (5x – 7y) = ……………………A) 15x2 – 3y2 B) 15x2 + 4xy – 35y2 C) 15x2 – 4xy D) 15x – 13xy2

Answer»

B) 15x² + 4xy – 35y²

Correct option is (B) 15x² + 4xy – 35y²

(3x + 5y) (5x – 7y) \(=15x^2-21xy+25xy–35y^2\)

= \(15x^2+4xy–35y^2\)