Cubic Functions of a Particular Form (VCE SSCE Mathematical Methods): Flashcards

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Cubic Functions of a Particular Form
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General form of cubic function in this topic

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

Point of inflection for y=a(xh)3+ky = a(x - h)^3 + k

(h,k)(h, k)

Domain of all cubic functions

R\mathbb{R} (all real numbers)

Range of all cubic functions

R\mathbb{R} (all real numbers)

Effect of a>1a > 1 on cubic graph

Graph becomes steeper (narrower)

Effect of 0<a<10 < a < 1 on cubic graph

Graph becomes less steep (broader)

Inverse function of f(x)=x3f(x) = x^3

f1(x)=x13f^{-1}(x) = x^{\frac{1}{3}} or x3\sqrt[3]{x}

Transformation from y=x3y = x^3 to y=(xh)3y = (x - h)^3

hh units right (h>0h > 0) or left (h<0h < 0)

Transformation from y=x3y = x^3 to y=x3+ky = x^3 + k

kk units up (k>0k > 0) or down (k<0k < 0)

Point of inflection for y=x3y = x^3

(0,0)(0, 0)

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