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W(x) =(x²+1)(x+3) - (x+3 )(4-3x²) =(x+3)(x²+1-(4-3x²))=(x+3)(x²+1-4+3x²)=(x+3)(4x²-3)
W(x)=(x+3)(4x²-3)=(x+3)(2x-√3)(2x+√3)
b) W(x) =(2x-3)(x^2-3) - (2x-3)(5+2x^2) wyłączam (2x-3)
W(x) =(2x-3)(x²-3) - (2x-3)(5+2x²)=(2x-3)(x²-3-(5+2x²))=(2x-3)(x²-3-5-2x²)=(2x-3)(-x²-8) drugi nie rozkłada się Δ<0
b)(2x-3)(x^2-3-5-2x^2)=(2x+3)(-x^2-8)