Question

помогите пожалуйста!
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Answer 1

1) (a+b)(c-d) = a(c-d) + b(c-d) = ac-ad + bc-bd

2) (3y+1)(4y-6) = 3y(4y-6) + 1(4y-6) = 12y²-18y + 4y-6 = 12y²-(18y+4y)-6 = 12y²-22y-6

3) (-2m-3)(5-m) = -2m(5-m) - 3(5-m) = -10m+2m² - 15+3m = (-10m+3m)+2m²-15 = -7m+2m²-15

4) (2x²-3)(x²+4) = 2x⁴+8x² - 3x²-12 = 2x⁴+(8x²-3x²)-12 = 2x⁴+5x²-12

5) (-c - 4)(c³+3) = -c⁴-3c - 4c³-12

6) (5x²-x)(6x²+4x) = 30x⁴+20x³ - 6x³-4x² = 30x⁴+14x³-4x²