quadratic help (1 Viewer)

[chewy123]

Find the value of k in

x^2 + 3x + k - 1 = 0

if the quadratic equation has: one root double the other


thx

 

[kaz1]

Let roots be A and 2A.

A + 2A= 3A = -3

A=-1

2A² = k-1

Since A=-1

2=k-1

k=3

 

[chewy123]

thx