a) będzie 2x^2 - 13x
b) jest dobrze
c) 2ax - 6x + 4x - 8 = 2ax - 2x - 8
d) = -4x × 5 + -4x × 2x + 2x × -2x - 2x × 5 = -20x - 8x^2 - 4x^2 - 10x = -30x - 12x^2
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a) będzie 2x^2 - 13x
b) jest dobrze
c) 2ax - 6x + 4x - 8 = 2ax - 2x - 8
d) = -4x × 5 + -4x × 2x + 2x × -2x - 2x × 5 = -20x - 8x^2 - 4x^2 - 10x = -30x - 12x^2