Question

найдите f(x) если f(x)=9x^8-8x^7+4x-11

Answer 1

F' = 9*8 X^7 - 8*7X^6 + 4

F' = 72 X^7 - 56 X^6 + 4

F' = 4( 18X^7 - 14X^6 + 1)

F' =18X^7 - 14X^6 + 1

F" = 126 X^6 - 84X^5 = 42* (3X^6 - 2X^5)

F" = 0

3X^6 - 2X^5 = 0

X^5 ( 3X - 2) = 0

X1 = 0            X2 = 2\3

ОТВЕТ: 0; 2\3