1) (5b+2)(1-2b) = 5b-10b²+2-4b = b-10b²+2 = -10b²+b+2
2) -5(x-3)(x+2) = (-5x+15)(x+2) = -5x²-10x+15x+30 = -5x²+5x+30
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Answers & Comments
5b-10b^2+2-4x
x-10b^2+2
Конечный ответ: -10b^2+b+2
2) ? не проходила еще трехчлены, извини
1) (5b+2)(1-2b) = 5b-10b²+2-4b = b-10b²+2 = -10b²+b+2
2) -5(x-3)(x+2) = (-5x+15)(x+2) = -5x²-10x+15x+30 = -5x²+5x+30