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What is -a + b - c + d

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by sanju09 » Sat Jun 19, 2010 2:22 am
What is -a + b - c + d if (x - 1/5) (x + 1) (x + 3/7) = a x^3 + b x^2 + c x + d for all real values of x?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
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by kvcpk » Sat Jun 19, 2010 2:26 am
sanju09 wrote:What is -a + b - c + d if (x - 1/5) (x + 1) (x + 3/7) = a x^3 + b x^2 + c x + d for all real values of x?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
put x = -1. then

-a + b - c + d = (-1 - 1/5) (-1 + 1) (-1 + 3/7)
=0

A
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by sanju09 » Sat Jun 19, 2010 2:29 am
kvcpk wrote:
sanju09 wrote:What is -a + b - c + d if (x - 1/5) (x + 1) (x + 3/7) = a x^3 + b x^2 + c x + d for all real values of x?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
put x = -1. then

-a + b - c + d = (-1 - 1/5) (-1 + 1) (-1 + 3/7)
=0

A
stunning approach
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
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