Question

1/3 (6x+15y)(6x-15y)=​

Answer 1

$= \frac{1}{3} \times (6x + 15y)(6x - 15y) \\ \ = \frac{1}{3} \times( \: (6x) {}^{2} - (15y) {}^{2} ) \\ = \frac{1}{3} \times (36 {x}^{2} - 225 {y}^{2} ) \\ = \frac{1}{3} \times 3 \: (12 {x}^{2} - 75 {y}^{2} ) \\ = (12 {x}^{2} - 75 {y}^{2} )$

Hope it helps