Question

if x+1 is a factor of 2x^2+kx . Then find the value of k​

Answer 1

Answer:

k=2

Step-by-step explanation:

given x+1 is the factor

so x =(-1)

substitute value of x in the equation

2(-1)²+k(-1)=0

2(1)-k=0

2-k=0

-k=-2

minus minus cancel

k=2

Answer 2

Answer:

Let x+1=0 (we always take 0 as it per the rules)

x+1=0 or x=0-1 or x= -1

We will keep -1 in the place of x.

2(-1)²+k(-1) or (-1)(-1)= 1 (in Multiplication, negative mulitiplied by negative is always positive)

2(1)+(-k) [As -k(-1)= -k]

2+(-k)=0 or 2=0+k [by transposing k]

2=k [Answer]

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