f(x)=x^2, find f ( 3 + √5)
so is it 20√5 ?
(3 + sq root 5) (3 + sq root 5) ... foil
= 9 + 6 sq root 5 + 5
= 14 + 6 sq root 5
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(3 + sq root 5) (3 + sq root 5) ... foil
= 9 + 6 sq root 5 + 5
= 14 + 6 sq root 5