x² - (2x+3)² ma wyjść -3(x+1)(x+3)
x² - (2x+3)² = x² - (4x² + 12x + 9) = x² - 4x² - 12x - 9 = - 3x² - 12x - 9 = -3(x² + 4x + 3) = -3(x + 1)(x + 3)
x² + 4x + 3
Δ = 16 - 12 = 4
√Δ = 2
x1 = (-4 - 2)/2 = -6/2 = -3
x2 = (-4 + 2)/2 = -2/2 = -1
x² + 4x + 3 = (x + 3)(x +1)
x²-(2x+3)²=x²-(4x²+12x+9)=-3x²-12x-9=-3(x+1)(x+3)
Δ=144-108=36
√Δ=6
x=(12-6)/(-6)=-1
x=(12+6)/(-6)=-3
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x² - (2x+3)² = x² - (4x² + 12x + 9) = x² - 4x² - 12x - 9 = - 3x² - 12x - 9 = -3(x² + 4x + 3) = -3(x + 1)(x + 3)
x² + 4x + 3
Δ = 16 - 12 = 4
√Δ = 2
x1 = (-4 - 2)/2 = -6/2 = -3
x2 = (-4 + 2)/2 = -2/2 = -1
x² + 4x + 3 = (x + 3)(x +1)
x²-(2x+3)²=x²-(4x²+12x+9)=-3x²-12x-9=-3(x+1)(x+3)
Δ=144-108=36
√Δ=6
x=(12-6)/(-6)=-1
x=(12+6)/(-6)=-3