Question

(3y^2 + 9) (3y^2 - 5)​

Answer 1

Answer:

$(3 {y}^{2} + 9)(3 {y}^{2} - 5)$

$9 {y}^{4} - 15 {y}^{2} + 27 {y}^{2} - 45$

$9 {y}^{4} + 12 {y}^{2} - 45$

Dividing it by 3

$3 {y}^{4} + 4 {y}^{2} - 15$

${y}^{2} (3 {y}^{2} + 4) - 15$