Jambmaths question:

Find the remainder when $2{{x}^{3}}-11x+8x-1$is divided by *x* + 3

Option A:

–871

Option B:

–781

Option C:

–187

Option D:

–178

Jamb Maths Solution:

$\begin{align} & \text{Let }f(x)=2{{x}^{3}}-11{{x}^{2}}+8x-1 \\ & \text{The remainder when }f(x)\text{ is divided by (}x+3)\text{ is the } \\ & \text{value of }f(-3) \\ & f(-3)=2{{(-3)}^{3}}-11{{(-3)}^{2}}+8(-3)-1 \\ & f(-3)=-54-99-24-1 \\ & f(-3)=-178 \\\end{align}$

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## Comments

elizabethrboatright

Wed, 10/11/2017 - 07:04

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