Question

solve (x+3) (x-3) (x²+9)

Answer 1

Answer:${x}^{4}$-81

Step-by-step explanation:

For this you should know the formula for a^2-b^2

(x-3)(x+3)=${x}^{2}$-9

Again,

(${x}^{2}$-9)(${x}^{2}$+9)

=${x}^{4}$-81

Answer 2

Answer:

Step-by-step explanation:

(x-3)(x+3)(x^2+9)

According to the identity (a-b) (a+b) = a^2 - b^2

x^2 -3^2 (x^2+9)

(x^2 -9)(x^2 + 9)

Again using the same identity

(x^2)^2 - 9^2

x^4 - 81 ------- answer!!

Hope it helps!!