This discussion is closed.
Tut
Badges: 2
#1
Report Thread starter 14 years ago
#1
Given that (x + 3) is a factor of 6x^3 - bx^2 + 18 find the value of b
0
Christophicus
Badges: 18
Rep:
?
#2
Report 14 years ago
#2
(Original post by Tut)
Given that (x + 3) is a factor of 6x^3 - bx^2 + 18 find the value of b
Use the same principles as the last question.
0
kikzen
Badges: 14
Rep:
?
#3
Report 14 years ago
#3
use the fact that when x = -3, all that = 0
0
Tut
Badges: 2
#4
Report Thread starter 14 years ago
#4
Cheers peeps :-)
0
nas7232
Badges: 16
Rep:
?
#5
Report 14 years ago
#5
(Original post by Tut)
Given that (x + 3) is a factor of 6x^3 - bx^2 + 18 find the value of b
F(-3) = 6(-3)^3 - bx^2 + 18 = 0
........= -162 - 9x + 18 = 0
.......=> -9b = 144
----.=> b = -16
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 19 Oct '19
  • Coventry University
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19
  • University of Birmingham
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19

Why wouldn't you turn to teachers if you were being bullied?

They might tell my parents (26)
7.22%
They might tell the bully (34)
9.44%
I don't think they'd understand (55)
15.28%
It might lead to more bullying (139)
38.61%
There's nothing they could do (106)
29.44%

Watched Threads

View All