polynomial question! (1 Viewer)

[bubblesss]

1) a root of the cubic equation ax^3 +bx^2 +cx +d =0 is equal to the sum of the other two roots. find the relation between a,b,c and d.

i've done this question but i need to check the answer with someone. so if anyone does it, could u please post up your answer.

thanks in advance :uhhuh:

 

[Drongoski]

1) a root of the cubic equation ax^3 +bx^2 +cx +d =0 is equal to the sum of the other two roots. find the relation between a,b,c and d.

i've done this question but i need to check the answer with someone. so if anyone does it, could u please post up your answer.

thanks in advance :uhhuh:

Post your answer - so we can comment.

 

[bubblesss]

Post your answer - so we can comment.

i got

b^3 + 8a^2d = 4abc

is that righttt?????

 

[Drongoski]

i got

b^3 + 8a^2d = 4abc

is that righttt?????

I got the same answer - so it's probably correct

 

[bubblesss]

I got the same answer - so it's probably correct

ok cool