Solve for k_4
k_{4}=20
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4\times 20=k_{4}\times 2^{2}
Multiply both sides by 20.
80=k_{4}\times 2^{2}
Multiply 4 and 20 to get 80.
80=k_{4}\times 4
Calculate 2 to the power of 2 and get 4.
k_{4}\times 4=80
Swap sides so that all variable terms are on the left hand side.
k_{4}=\frac{80}{4}
Divide both sides by 4.
k_{4}=20
Divide 80 by 4 to get 20.
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