Square of 3x – 4y is(a) 9x2 – 16y2 (b) 6x2 – 8y2(c) 9x2 + 16

1.	Square of 3x – 4y is(a) 9x2 – 16y2 (b) 6x2 – 8y2(c) 9x2 + 16y2 + 24xy (d) 9x2 + 16y2 – 24xy
Answer» (d) 9x² + 16y² – 24xy As per the condition in the question, (3x – 4y)² The standard identity = (a – b)² = a² – 2ab + b² Where, a = 3x, b = 4y Then, (3x – 4y)² = (3x)² – (2 × 3x × 4y) + (4y)² = 9x² – 24xy + 16y²

Square of 3x – 4y is(a) 9x2 – 16y2 (b) 6x2 – 8y2(c) 9x2 + 16y2 + 24xy (d) 9x2 + 16y2 – 24xy

Answer»

(d) 9x² + 16y² – 24xy

As per the condition in the question, (3x – 4y)²

The standard identity = (a – b)² = a² – 2ab + b²

Where, a = 3x, b = 4y

Then,

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

= 9x² – 24xy + 16y²