if x=2 is a root of ax^2 - bx -x = 0, state the relationship connecting a,b, c and show that x=2 is also a root of(adsbygoogle = window.adsbygoogle || []).push({});

bx^2 + cx - 8a = 0.

the answer for the first part of the question is

4a - 2b - c = 0.

i need to know how to prove for the second part.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Functions and quadratic equations

**Physics Forums | Science Articles, Homework Help, Discussion**