Himeviz
Answered

(s-4)^2-81=0

 

by  extracting equare roots 

 

Sagot :

AnneCviz
(s-4)² -81 = 0

(s-4)² = 81       ––> get the square root of both sides

s - 4 = ±9

s = ±9 +4

(use +9) s = 13 ;   (use -9)  s = -5