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OpenStudy (anonymous):
What is the coefficient of the fourth term in the expansion of (x - 5)7? A) −4375 B) −125 C) 125 D) 4375
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OpenStudy (isaidavila):
Use pascal triangle
OpenStudy (campbell_st):
well the 4th term will be \[^7C_{3}(x)^{7-3}(-5)^3\]
OpenStudy (campbell_st):
you need to use combinations....
OpenStudy (anonymous):
alright thanks I got it
OpenStudy (isaidavila):
(x+y)^7 The fourth término is 35x^4y^3 Now replace y for -5
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