discriminant C1 question

2x(2)+kx-(k+2)=0....this equation has 2 equal roots.Find the value of k.

im getting the answer as -4, but the answers say it should be 4.
can someone help me out
thanks

Reply 1

Mark13

Original post by pakizrulez

2x(2)+kx-(k+2)=0....this equation has 2 equal roots.Find the value of k.

im getting the answer as -4, but the answers say it should be 4.
can someone help me out
thanks

I agree with your answer.

Reply 2

soup

Original post by pakizrulez

2x(2)+kx-(k+2)=0....this equation has 2 equal roots.Find the value of k.

im getting the answer as -4, but the answers say it should be 4.
can someone help me out
thanks

c in your discriminant should be -k-2 because the eqn is not of the form:

ax^2 + bx + c

Reply 3

Physics Enemy

Original post by pakizrulez

2x(2)+kx-(k+2)=0....this equation has 2 equal roots.Find the value of k.

im getting the answer as -4, but the answers say it should be 4.
can someone help me out
thanks