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2x² = 8
x²= 4
x₁ = +2
x₂² = -2
2) B
x 7 = 7x
x 1 = x = 8x
(x+7)(x+1)=0
x₁ = -7
x₂ = -1
3) A
x -3 = -3x
x -2 = -2x = -5x
(x-3)(x-2)=0
x₁ = 3
x₂ = 2
4) B
x 3 = 3x
x -4 = -4x = -x
(x+3)(x-4)=0
x₁ = -3
x₂ = 4
5) B
x² - 4x = 32
x² - 4x - 32 = 0
x -8
x 4
(x-8)(x+4)
x₁ = 8
x₂ = -4
6) B
x² - 9 = 0
(x-3)(x+3)=0
x₁= +3
x₂ = -3
7) D
x² - 7 = 0
√ x² = √7
x₁ = √7
x₂ = -√7
8) C
x(x+3) - 5(2x-4) = 2x
x² + 3x -10x + 20 = 2x
x² -9x +20 = 0
x -4
x -5
(x-4) (x-5)=0
x₁=4
x₂=5