Question

please explain step by step....​

Answer 1

Answer:

(c)

Step-by-step explanation:

let's put value x = 3

9(3)2 -81 =0

9×9 - 81=0

81 -81 = 0

and when x = -3

9(-3)2 - 81 =0

9×9 - 81 =0

81 -81 = 0

in this question we have to use hit and trial method....

hope it helped