Ответ:
Объяснение:
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а) (x+3)(x-7) - 4x(5 - 2x) = x^2-7x+3x-21-20x+8x^2 = 9x^2-24x-21.
b) (x + 2)(x-6) + (x + 3)(y-4) = (x^2-6x+2x-12)+(xy-4x+3y-12) = x^2-8x-24+xy+3y.
в) (x-3)(3x+1) - (2x + 3)(4x-1) = (3x^2+x-9x-3) - (8x^2-2x+12x-3) = (3x^2+x-9x-3)-(8x^2-10x+3) = -5x^2-18x.
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Answers & Comments
Ответ:
Объяснение:
......
Ответ:
а) (x+3)(x-7) - 4x(5 - 2x) = x^2-7x+3x-21-20x+8x^2 = 9x^2-24x-21.
b) (x + 2)(x-6) + (x + 3)(y-4) = (x^2-6x+2x-12)+(xy-4x+3y-12) = x^2-8x-24+xy+3y.
в) (x-3)(3x+1) - (2x + 3)(4x-1) = (3x^2+x-9x-3) - (8x^2-2x+12x-3) = (3x^2+x-9x-3)-(8x^2-10x+3) = -5x^2-18x.