Math, asked by surabhijatte667, 3 months ago


3) One of the roots of quadratic equation 2x + x - 2 = 0 is 2, find the value of k .​

Answers

Answered by wwwsanju35791
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 srout6466
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

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