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akar2nya p, q dan r
[(p + 1)(q + 1)(r + 1)]² = [(pqr + (pq + pr + qr) + (p + q + r) + 1)]²
= [(2) + (2 + 2 + 2) + 3 + 1]²
= (12)²
= 144
x³ - 3x² + 2x - 1 = 0 didapat a = 1 , b = - 3 , c = 2, dan d = -1
(p+1)²(q+1)²(r+1)²={(p+q)(q+1)(r+1)}²
= {pqr + (pq+pr+qr) + (p+q+r)}²
= (-b/a + c/a - d/a)²
= (3/1 + 2/1 + 1/1)²
= (3+2+1)²
= 6²
= 36