Determining the Rule for the Graph of a Polynomial (VCE SSCE Mathematical Methods): Flashcards

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Determining the Rule for the Graph of a Polynomial
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Points needed to determine polynomial of degree nn

n+1n + 1 points

Points needed to determine a cubic function (degree 3)

4 points

Translated form of cubic with inflection point (h,k)(h, k)

f(x)=a(xh)3+kf(x) = a(x - h)^3 + k

Cubic form with 3 distinct x-intercepts alpha, eta, gamma

y = a(x - alpha)(x - eta)(x - gamma)

Cubic form: touches at alphaalpha, crosses at eta

y = a(x - alpha)^2(x - eta)

General form of cubic function

y=ax3+bx2+cx+dy = ax^3 + bx^2 + cx + d

Graph crosses x-axis → factor type

Simple linear factor

Graph touches x-axis → factor type

Repeated factor (squared)

Mnemonic: 'Touch means...'

twice (factor appears squared)

Where is the y-intercept on a graph?

Where x=0x = 0

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