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Simplifying
5k2 + 10 = 90
Reorder the terms:
10 + 5k2 = 90
Solving
10 + 5k2 = 90
Solving for variable 'k'.
Move all terms containing k to the left, all other terms to the right.
Add '-10' to each side of the equation.
10 + -10 + 5k2 = 90 + -10
Combine like terms: 10 + -10 = 0
0 + 5k2 = 90 + -10
5k2 = 90 + -10
Combine like terms: 90 + -10 = 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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