-36=(k-21)2

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Solution for -36=(k-21)2 equation: 



-36=(k-21)2

We move all terms to the left:

-36-((k-21)2)=0



We calculate terms in parentheses: -((k-21)2), so:

(k-21)2

We multiply parentheses

2k-42

Back to the equation:

-(2k-42)



We get rid of parentheses

-2k+42-36=0

We add all the numbers together, and all the variables

-2k+6=0

We move all terms containing k to the left, all other terms to the right

-2k=-6

k=-6/-2

k=+3

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