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x² + x - 3 = 3x
x² + x - 3x - 3 = 0
x² - 2x - 3 = 0
1x² - 2x - 3 = 0

ax² + bx + c = 0
a=1, b=-2, c=-3

δ = b² - 4ac

x₁ = -b + √ δ
______2a

x₂ = -b - √ δ
_____2a

δ = (-2)² - 4(1)(-3)
δ = 4 - -12
δ= 4 + 12
δ = 16

x₁ = -b + √ δ
_____2a

x₁ = - -2 + √ 16
_____2(1)

x₁ = +2 + 4
_____2(1)

x₁= 6
___2
x_{1 =3}


x₂ = -b - √ δ
_____2a

x₂ = - -2 - √ 16
______2(1)

x₂ = +2 - 4
____2(1)

x₂= -2
___2
x₂ = - 1

x= -1, 3