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Simplifying
7k2 + -21 = 7
Reorder the terms:
-21 + 7k2 = 7
Solving
-21 + 7k2 = 7
Solving for variable 'k'.
Move all terms containing k to the left, all other terms to the right.
Add '21' to each side of the equation.
-21 + 21 + 7k2 = 7 + 21
Combine like terms: -21 + 21 = 0
0 + 7k2 = 7 + 21
7k2 = 7 + 21
Combine like terms: 7 + 21 = 28
7k2 = 28
Divide each side by '7'.
k2 = 4
Simplifying
k2 = 4
Take the square root of each side:
k = {-2, 2}
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