Answers: 3
Firstly, subtract by the number 
 on each of your sides
because it gives us the result of 
 because it equals: 
Nextly, we have to take our square root 
±
Solve the square root and you have found your answer![\boxed{\boxed{\bold{x=4[or]x=-4}}}](/tpl/images/0370/4221/b1cfd.png)
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What is the value of x, when x2 + 5 = 21?...
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