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Simplifying
9k2 + 21 = 25
Reorder the terms:
21 + 9k2 = 25
Solving
21 + 9k2 = 25
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 + 9k2 = 25 + -21
Combine like terms: 21 + -21 = 0
0 + 9k2 = 25 + -21
9k2 = 25 + -21
Combine like terms: 25 + -21 = 4
9k2 = 4
Divide each side by '9'.
k2 = 0.4444444444
Simplifying
k2 = 0.4444444444
Take the square root of each side:
k = {-0.666666667, 0.666666667}
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