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@ @XW@ @pý†bɾa@ @
x +3 = −9
1−x x
−9(1 − x) = x(x + 3)
−9 + 9x = x 2 + 3x
x 2 − 6x + 9 = 0
(x − 3)2 = 0
.x1 = x2 = 3
.(x + 1)2 = 2x2 − 5x + 11 ()
(x + 1)2 = 2x 2 − 5x + 11
x 2 + 2x + 1 = 2x 2 − 5x + 11
x 2 − 7x + 10 = 0
(x − 2)(x − 5) = 0
x −2 = 0 x −5 = 0
x =2 x =5
.x2 = 5 x1 = 2
[Completing The Square] (.)
x 2 + 6x − 2 = 0
. x 2 + 6x − 2
ax2 + bx + c = 0 (x + p)2 = q
.