Question

x to the power 4 - 81​

Answer 1

Answer:

(x+3) (x-3) (x2-3)

x

4

−81=(x

2

)

2

−(9)

2

=(x

2

+9)(x

2

−9)

= (x

2

+9)(x−3)(x+3)

Answer 2

Answer:

x= +3 or -3 or +3i or -3i

Step-by-step explanation:

x^4-81=0

x^4=81

x^4=3^4

(x^2)^2= √9^2

x^2= +9 or -9

x= √3^2 or √(-3)^2

x= +3 or -3 or +3i or -3i