What are the solutions to (x+7)^2=81

asked Mar 13, 2019 197k views

3 votes

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3 votes

(x + 7)² = 81

x + 7 = √81

x+7 = 9

x = 9 - 7

x = 2

8.3k points

0 votes

$(x+7)^2=81\iff x+7=\pm√(81)\\\\x+7=-9\ \vee\ x+7=9\qquad\text{subtract 7 from both sides}\\\\\boxed{x=-16\ \vee\ x=2}$

Sheridan answered Mar 17, 2019

7.7k points

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