Answer :
k^2-2*k+12
Substitute 4 for k
4^2-2*4+12
Square 4
16-2*4+12
Multiply 2 by 4
16-8+12
Subtract 8 from 16
8+12
Add
Final Answer: 20
Substitute 4 for k
4^2-2*4+12
Square 4
16-2*4+12
Multiply 2 by 4
16-8+12
Subtract 8 from 16
8+12
Add
Final Answer: 20