Question

11. Evaluate (3x + y)(3x - y)(9x² + y²)
(h) 817
14​

Answer 1

Step-by-step explanation:

$(3x + y)(3x - y)(9 {x}^{2} + {y}^{2} ) \\ = (9 {x}^{2} - {y}^{2} )(9 {x}^{2} + {y}^{2} ) \\ = 81 {x}^{4} - {y}^{4}$