19 Let f(x) = 1 + x + x² + x³ + · ..+ x²n+!. a Show that the only solution of f(x) b Show that (x + 1)² is a factor of f' (x) – (n + 1)x". c Hence show that a tangent to y = f(x) is never horizontal. = 0 is x = -1.

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19 Let f(x) = 1 + x + x² + x³ + · ..+ x²n+!.
a Show that the only solution of f(x)
b Show that (x + 1)² is a factor of f' (x) – (n + 1)x".
c Hence show that a tangent to y = f(x) is never horizontal.
= 0 is x = -1.
Transcribed Image Text:19 Let f(x) = 1 + x + x² + x³ + · ..+ x²n+!. a Show that the only solution of f(x) b Show that (x + 1)² is a factor of f' (x) – (n + 1)x". c Hence show that a tangent to y = f(x) is never horizontal. = 0 is x = -1.
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