Page 108 - aljaber

@ @YU@ @pý†bɾa@ @

:

α + 1 + β + 1 = (α + β) + α + β = 6 + 6 = 48
βα αβ 7 7

:

 α + 1  β + 1  = αβ + 1 + 2 = 7 + 1 + 2 = 64
β α αβ 7 7

:

7x2 − 48x + 64 = 0

. 12 .
()
20

. 12 − x . x

.A

A = 1 x(12 − x)
2

1 x(12 − x) = 20
2

x(12 − x) = 40

12x − x 2 − 40 = 0

x 2 − 12x + 40 = 0