1.

Find the product:(x + 3y) (3x – y)

Answer»

(x + 3y) (3x – y)

= x (3x – y) + 3y (3x – y)

= x × 3x – x × y + 3y × 3x – 3y × y

= 3x2 – xy + 9yx – 3y2

= 3x2 – xy + 9xy – 3y2

= 3x2 + 8xy – 3y2



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