1. if alpha n beta are zero's of xsq_7x+7 find the value of (a) 1/alpha + 1/beta - alphabeta

(b) alpha sq + beta sq

(c) alpha cube + beta cube

(d) alpha - beta

Since α and β are zeros of

Therefore, 

Sum of zeros , α+β = -coefficient of xcoefficient of x2=

and

product of zeros ,  αβ = constant termcoefficient of x2=

 

Now, 

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