Question

(2x - 3)^2 = 2x -1 помогите решить!!

Answer 1

( 2х - 3 )^2 = 2х - 1
4х^2 - 12х + 3 - 2х + 1 = 0
4х^2 - 14х + 4 = 0
4( х^2 - 3,5х + 1 ) = 0
D = 12,25 - 4 = 8,25 = 8 1/4 = 33/4 = ( 1/2V33 )^2
X1 = ( 3,5 + 1/2V33 ) : 2 = 1,75 + 1/4V33
X2 = 1,75 - 1/4V33

Comments

В какой строчке ?

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Во втором

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Поняла жаль (( извини

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4х^2 - 12х + 9 - 2х + 1 = 0

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4х^2 - 14х + 10 = 0

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4( х^2 - 3,5х + 2,5 ) = 0

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D = 12,25 - 10 = 2,25 = 1,5^2

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X1 = ( 3,5 + 1,5 ) : 2 = 2,5

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X2 = ( 3,5 - 1,5 ) : 2 = 1

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Ответ 2,5 ; 1