The roots of the equation x 2 − 6 x + 8 = 0 are α and β . Find the equation whose roots are: α 2 , β 2 ?
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It is simpler to use the Vieta's formulas to get that α β = 8 ⟹ α 2 β 2 = 6 4 , and there was only one option that had c = 6 4 .
P 1 = α β = 1 8 = 8 N o w F i n d a n e q u a t i o n w h o s e r o o t s a r e α 2 & β 2 S u m o f r o o t s S 2 = α 2 + β 2 = α 2 + β 2 + 2 α β − 2 α β = ( α + β ) 2 − 2 α β = ( S 1 ) 2 − 2 P 1 = 6 2 − 2 ( 8 ) = 3 6 − 1 6 S 2 = 2 0 P r o d u c t s o f r o o t s P 2 = α 2 β 2 = ( α β ) 2 = ( P 1 ) 2 = 8 2 P 2 = 6 4 T o f i n d E q u a t i o n , U s e t h i s f o r m u l a x 2 − S x + p = 0 w e h a v e = > x 2 − 2 0 x + 6 4 = 0 a n s . . . . . . . . . . .
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x² – 6x + 8 = 0 then (x – 4)(x – 2) = 0 then x = 4 or 2
for other equation x = 16 or x = 4 (square of roots of above equation
so equation is (x – 16)(x – 4) = 0 or x² – 2x + 64 = 0