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Simplifying
-5k2 + 80 = 0
Reorder the terms:
80 + -5k2 = 0
Solving
80 + -5k2 = 0
Solving for variable 'k'.
Move all terms containing k to the left, all other terms to the right.
Add '-80' to each side of the equation.
80 + -80 + -5k2 = 0 + -80
Combine like terms: 80 + -80 = 0
0 + -5k2 = 0 + -80
-5k2 = 0 + -80
Combine like terms: 0 + -80 = -80
-5k2 = -80
Divide each side by '-5'.
k2 = 16
Simplifying
k2 = 16
Take the square root of each side:
k = {-4, 4}
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