Resposta :

x² -2(x-1) = -2x+7

x² -2x + 2 = -2x + 7

x² - 2x + 2x + 2 - 7 = 0

x² + 0x - 5 = 0

Δ = b²-4ac

Δ = 0² - 4.1.(-5)

Δ = 0 +20

Δ = 20

x = (-b+/-\/Δ)/2a

x = (-0+/-\/20)/2.1

x = +/-\/20/2

x = +/- (\/4.5)/2

x = +/- 2\/5/2

x' = 2\/5/2 = \/5

x" = -2\/5/2 = -\/5

S:{-\/5; +\/5}

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