Question

determine k so that 4x^2-3x+k has one root which is twice the other root..

Answer 1

help

Answer 2

(4x - a)(x - b)
4x^2 -(4b+a)x + ab
1. 4b + a = 3
2. ab = k
3. a = 2b

sub 3 into 1:
4b + 2b = 3
b = 1/2

sub that into 3:
a = 1

and into 2:
k = 1/2

the graph: http://bit.ly/pqxMPt

Answer 3

:)