+0  
 
0
336
1
avatar

Let r and s be the roots of 3x^2 + 4x + 12 = x^2 + 5x + 1. Find r^2 + s^2.

 Feb 23, 2021
 #1
avatar+600 
+1

$2x^2-x+11=0$

$r^2+s^2=(r+s)^2-2rs$

By Vieta: $r+s=\frac{1}{2}, rs=\frac{11}{2}$

Answer: $\frac{1}{4}-11=\boxed{\frac{-43}{4}}$.

 Feb 23, 2021

1 Online Users