Find p

123

New member
Joined
Nov 6, 2010
Messages
46
With which p meaning equation \(\displaystyle 3a^2+pa+24=0\) what rule I can use here or something?
[/i]
 

BigGlenntheHeavy

Senior Member
Joined
Mar 8, 2009
Messages
1,577
\(\displaystyle a \ = \ 3 \ is \ a \ solution \ to \ the \ equation \ f(a) \ = \ 3a^2+pa+24.\)

\(\displaystyle Hence, \ f(3) \ = \ 0 \ = \ 27+3p+24 \ (why?), \ \implies \ p \ = \ -17.\)

\(\displaystyle I'll \ let \ you \ do \ the \ check.\)
 
Top