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x³ - 8 = 0, Roots of a cubic equation

by destini
(killeen, texas 76543)











































The general equation of a cubic function is:

f(x) = ax³ + bx² + cx + d

the roots can be found algebraically or graphically

a function of this general type can have three real roots, or one real root and a complex conjugate pair.

Find the real root for the function shown below:


x^3 - 8

Comments for x³ - 8 = 0, Roots of a cubic equation

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Aug 09, 2010
algebra-2: cubic equation
by: Staff

The question:

x^3 - 8

The answer:


Roots of a cubic equation

x^3 – 8 = 0


Step 1: add +8 to each side of the equation

x^3 – 8 + 8= 0 + 8

x^3= 8


Step 2: compute the cube root of each side of the equation
x^3= 8

cube root of x^3 = cube root of 8

x = 2


The FINAL ANSWER is: x = +2



You can check this answer, or answers to other equations by using this free calculator:


http://www.mathway.com/





Thanks for writing.


Staff
www.solving-math-problems.com


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