Polynomials (1 Viewer)

[letsdie45]

Given two roots of 2x³ - kx² +8 = 0 are equal, find k.

 

[Timothy.Siu]

Given two roots of 2x³ - kx² +8 = 0 are equal, find k.

just let the roots be a,a,b

 

[shady145]

<HR style="BACKGROUND-COLOR: #d1d1e1; COLOR: #d1d1e1" SIZE=1> Given two roots of 2x<SUP>3</SUP> - kx<SUP>2</SUP> +8 = 0 are equal, find k.

sum one at a time = k/2 = 2a + b
2 at a time = 0 = a^2 + 2ab = a + 2b
3 at a time = -4 = ba^2
use what tim said and chose from above what to do

 

[letsdie45]

oh got it thanks