3) One of the roots of quadratic equation 2x + x - 2 = 0 is 2, find the value of k .
Answers
Answered by
2
Answer:
2x
2
+kx−2=0
if one root os -2 then
if satisfy the equation
2(−2)
2
+k(−2)−2=0
8−2−2k=0
k=
2
6
=3
Answered by
2
Step-by-step explanation:
-2 is one of the roots of the equation 2x2 + kx – 2 = 0.
∴ Putting x = – 2 in the given equation,
we get 2(-2)2 + k(-2) -2 = 0
∴ 8 – 2k – 2 = 0
∴ 6 – 2k = 0
∴ 2k = 6
∴ k = 6/2
∴ k = 3
Similar questions