The roots of the equation x^2-px+8=0 are alpha and beta. If the roots differ by 2
a. Calculate the possible values of p
b. Hence, find the possible values of alpha^3+beta^3
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Answers
Answered by
3
Answer:
p = 6 & -6
alpha^3 + Beta^3 = 72 & -72 respectively
Step-by-step explanation:
x^2 - px + 8 = 0
roots are alpha & Beta
alpha = Beta + 2
(x - alpha)(x-Beta) = 0
(x - (Beta+2))(x-Beta) = 0
x^2 - x Beta - x Beta - 2x + Beta^2 + 2Beta
x^2 - x (2beta + 2) + (beta^2 + 2Beta)
so p = 2beta + 2
beta^2 +2Beta = 8
Beta^2 + 4beta - 2Beta - 8 = 0
(Beta+4)(Beta-2) = 0
Beta = -4 & 2
alpha = Beta +2 = -2 , 4 (respectively for beta = -4 & 2 )
(alpha , Beta ) = (-2 , -4) & (4 ,2)
p = 2beta + 2 = -6 for Beta = -4
= 6 for Beta = 2
alpha^3 + Beta ^3
(-2)^3 + (-4)^3 = -8 - 64 = -72
4^3 + 2^3 = 64 + 8 = 72
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