if alpha,beta are the roots of 2x^2+5x+4=0 find value of alpa^3+beta^3
Answers
Answered by
0
Answer:
Step-by-step explanation:
Fiven polynomial's factorisation is not possible
Answered by
1
Answer:-0.625
Step-by-step explanation:
Alpha+beta= -b/a = -5/2
Alpha*beta= c/a = 4/2 = 2
(Alpha + beta)^3 =alpha^3+beta^3 +3*alpha*beta(alpha+beta)
=>(-5/2)³=alpha³+beta³ +3(2)(-5/2)
=>-125/8=alpha³+beta³ - 15
=>Alpha³+beta³= 15 - 125/8
=>Alpha³+beta³ = -0.625
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