# EXPRESS X1^3+X2^3 IN TERMS OF THE COEFFICIENTS OF THE EQUATION

"Which is the value of the sum x1^3 + x2^3 if x1,x2 are solutions of the equation x^2-5x+6=0" idstore.vn Editorial, 7 Aug. 2010, https://www.idstore.vn/homework-help/which-value-sum-x1-3-x2-3-x1-x2-solutions-equation-188641.Accessed 25 Dec. 2022.

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Who are the experts?Our certified Educators are real professors, teachers, and scholars who use their academic expertise to tackle your toughest questions. Educators go through a rigorous application process, and every answer they submit is reviewed by our in-house editorial team. f(x) = x^2 - 5x + 6

x1 & x2 are solution

We need to lớn determine the value of x1^3 + x2^3

From viete"s rule, we know that:

x1+ x2 = -b/a = 5.........(1)

x1*x2 = c/a = 6...........(2)

But f(x1) = f(x2) =0

Multiply 3 by x1 and (4) by x2

= 5<(x1+x2)^2 - 2x1*x2> - 6(x1+x2)

= 5(5^2) - 5(2*6) - 6(5)

= 125 - 60 - 30

=125 - 90 = 35

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