Answers

  • Brainly User
2016-06-24T14:12:30+08:00
(k + 7)² = 196

( \sqrt{k+7}) ^{2}  =  \sqrt{196}    Find the roots of both sides

k + 7 = + 14                  k + 7 = - 14
k = + 14-7                    k = -14 - 7
k = 7                            k = -21

ANSWER:  k = 7  and -21

Check:  
(k + 7)² = 196      
(7 + 7)² = 196
196 = 196       (TRUE)

(-21 + 7)² = 196
(- 14)² = 196
196 = 196 (TRUE)

 
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