First slide
Theory of expressions
Question

Let α and βbe the solutions of the quadratic equationx21154x+1=0, then α14+β14is equal to

Moderate
Solution

we have,
x21154x+1=0α+β=1154,αβ=1  (α+β)2=α+β+2αβ=1154+2=1156  α+β=1156=34 Again,  α1/4+β1/42=α+β+2(αβ)1/4=34+2=36 α1/4+β1/4=36=6

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