20 s(s² +2s+5) 4 As + B + s (s² +2s+5) 20= 4(s² + 2s + 5) + s(As + B) S: 0= 4(2) + (B) B = -8 s²: 0= 4+ A A = -4

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter9: Sequences, Probability And Counting Theory
Section9.4: Series And Their Notations
Problem 50SE: The sum of terms 50k2 from k=x through 7 is 115. What is x?
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20
4
+
As + B
s(s²+2s+5) s (s² +2s+5)
20= 4(s² + 2s + 5) + s(As + B)
0= 4(2) + (B)
B = -8
s²: 0= 4+ A
A = -4
S:
Transcribed Image Text:20 4 + As + B s(s²+2s+5) s (s² +2s+5) 20= 4(s² + 2s + 5) + s(As + B) 0= 4(2) + (B) B = -8 s²: 0= 4+ A A = -4 S:
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