Question

if 5 is one of the roots of 2x square+kx75 is 0 then k is​

Answer 1

Answer:

x=5

then

2x square+kx+75=0

2×5square+k×5+75=0

2×25+5k+75=0

50+5k+75=0

125+5k=0

5k=-125

k=-125/5

k=-25