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4 years ago

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

Mathematics

2 answers:

krek1111 [17]4 years ago

7 0

(x + 7)² = 81

x + 7 = √81

x+7 = 9

x = 9 - 7

x = 2

Kamila [148]4 years ago

6 0

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

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