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Heya
______________________________
Alfa + Beta = -5/2
And
Alfa × Beta = k/2
=>
Alfa² + Beta² + Alfa × Beta = 21/4
=>
(Alfa + Beta )² - (Alfa × Beta ) = 21/4
=>
( 25/4 ) - ( k/ 2 ) = 21/4
=>
25 - 2k = 21
=>
-2k = -4
=>
k = 2
______________________________
A² + B² = ( A + B )² - 2 A × B
______________________________
Alfa + Beta = -5/2
And
Alfa × Beta = k/2
=>
Alfa² + Beta² + Alfa × Beta = 21/4
=>
(Alfa + Beta )² - (Alfa × Beta ) = 21/4
=>
( 25/4 ) - ( k/ 2 ) = 21/4
=>
25 - 2k = 21
=>
-2k = -4
=>
k = 2
______________________________
A² + B² = ( A + B )² - 2 A × B
priyashree96:
Please answer my another question
Which one?
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