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pretty nice.
Note that: ( α + 1 ) ( β + 1 ) = α β + α + β + 1
By Vieta's Identity we get the sum and products of the solutions of x 2 − 3 4 x + 3 4 : a = 1 , b = − 3 4 , c = 3 4 α + β = a − b = 3 4 α β = a c = 3 4
Substituting the value:
α β + α + β + 1 = 3 4 + 3 4 + 1 = 6 9
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Well you should immediately think of the vieta's identity.
Yes, I applied your method or you can say vieta method
(α+1)(β+1)=αβ+α+β+1 Now αβ=(c/a)=34 α+β=(-b/a)=34 hence, total is 69
a+1*b+1=ab+a+b+1 Sum of roots =- b/a=34/1 Product of roots=c/a=34/1 Therefore, 34+34+1=69
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f ( x ) = x 2 − 3 4 x + 3 4 = ( x − α ) ( x − β )
f ( − 1 ) = 1 + 3 4 + 3 4 = ( − 1 − α ) ( − 1 − β )
⟹ 6 9 = ( 1 + α ) ( 1 + β )
Therefore, answer is 6 9