Question

3
one of the roots of equation 5
m² +2m 4k=0 is-7/5- complete
he following activity to find the value of 'k'
solution:
lone
is a root of quadratic equation
Sm² +2m tk=0
fut man
in the equation
tk=0
tk=o
11-D
9X
+ 2x
+​

Answer 1

p(m) = 5m² +2m 4k=0

p(-7/5) = 5(-7/5)² +2 × -7/5 +4k=0

p(-7/5) = 5× 49/25 - 14/5 +4k =0

p(-7/5) = 49/5 -14/5 +4k =0

p(-7/5) = 35/5 +4k =0

p(-7/5) = 7 +4k =0

k= -7/4