a) (2 + x)(3 - x) = 6 - 2x + 3x - x^2 = -x^2 + x + 6
b) (3+k)(4-m) = 12 - 3m + 4k - km = -km + 4k - 3m + 12
c) (5x-2)(3x+6) = 15x^2 + 30x - 6x - 12 = 15x^2 + 24x - 12
d) (-2a+2c)(4a+4c) = -4a^2 - 8ac + 8ac + 8c^2 = -4a^2 + 8c^2
a) (x+4)(3x²-2x-5) = 3x^3 - 2x^2 - 5x + 12x^2 - 8x - 20 =
= 3x^3 + 10x^2 - 13x - 20
b) (4x²+6xy+9y²)(2x-3y) = 8x^3 - 12x^2y + 12x^2y - 18y^2x + 18y^2x - 27y^3 8x^3 - 27y^3
(6x+12y)(x+2y+5)-(6y+3x)(2x+4y)-30(x-2y) = 6x^2 + 12xy - 30x + 12xy + 24y^2 + 60y -(12xy + 24y^2 + 6x^2 + 12xy) - 30x + 60y = 6x^2 + 12xy - 30x + 12xy + 24y^2 + 60y - 12xy - 24y^2 - 6x^2 - 12xy - 30x + 60y= -60x +120y
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a) (2 + x)(3 - x) = 6 - 2x + 3x - x^2 = -x^2 + x + 6
b) (3+k)(4-m) = 12 - 3m + 4k - km = -km + 4k - 3m + 12
c) (5x-2)(3x+6) = 15x^2 + 30x - 6x - 12 = 15x^2 + 24x - 12
d) (-2a+2c)(4a+4c) = -4a^2 - 8ac + 8ac + 8c^2 = -4a^2 + 8c^2
a) (x+4)(3x²-2x-5) = 3x^3 - 2x^2 - 5x + 12x^2 - 8x - 20 =
= 3x^3 + 10x^2 - 13x - 20
b) (4x²+6xy+9y²)(2x-3y) = 8x^3 - 12x^2y + 12x^2y - 18y^2x + 18y^2x - 27y^3 8x^3 - 27y^3
(6x+12y)(x+2y+5)-(6y+3x)(2x+4y)-30(x-2y) = 6x^2 + 12xy - 30x + 12xy + 24y^2 + 60y -(12xy + 24y^2 + 6x^2 + 12xy) - 30x + 60y = 6x^2 + 12xy - 30x + 12xy + 24y^2 + 60y - 12xy - 24y^2 - 6x^2 - 12xy - 30x + 60y= -60x +120y