Square of 3x – 4y is

⇒ To find square of (3x – 4y) using formula –

⇒ (a – b)²=a² + b² – 2ab

⇒ here, a = 3x and b= 4y

⇒ (3x – 4y)²= (3x)² + (4y)² – 2× (3x)×(4y)

⇒ (3x – 4y)²= 9x² + 16y² – 24xy

Option (a) does not match to our solution.

Option (b) does not match to our solution.

Option (c) does not match to our solution.

Option (d) does match to our solution.

So, option (d) is correct answer.