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Mathematics 7 Online
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

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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