Resposta:
Explicação passo a passo:
25)
= (2x²-3x-5).(-3x)
= 2x².(-3x) - 3x.(-3x) - 5.(-3x)
= - 6x³ + 9x² + 15x
_________________
26)
= 3.(2a²-3a-5).(-4a²)
= -12a².(2a²-3a-5)
= -24a⁴ + 36a³ + 60a²
________________
27)
(4a²b - 6ab - 7ab² + 3).(2ab)
= 8a³b² - 12a²b² - 14a²b³ + 6ab
________________
28)
= (4m-3).(3m+2)
= 12m² + 8m - 9m - 6
= 12m² - m - 6
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29)
(m²p-4mp+1).(5-mp)
= 5m²p - m³p² - 20mp + 4m²p² + 5 - mp
= 5m²p - m³p² - 21mp + 4m²p² + 5
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30) (-3x⁴+5x³+x²-2x+4).(1-2x)
= -3x⁴+6x⁵ + 5x³ - 10x⁴ +x² - 2x³ -2x +4x² +4 - 8x
= 6x⁵ - 3x⁴ -10x⁴ +5x³ -2x³ +x² +4x² -2x -8x+ 4
= 6x⁵ - 13x⁴ + 3x³ + 5x² - 10x + 4
____________
31)
= (3x²m - 4xm + 2).(2x²m - 3xm - 5)
= 6x⁴m² - 9x³m² - 15x²m - 8x³m² + 12x²m² + 20xm + 4x²m - 6xm - 10
= 6x⁴m² - 9x³m² -8x³m² + 12x²m² - 15x²m + 4x²m + 20xm - 6 xm - 10
= 6x⁴m² - 17x³m² + 12x²m² - 11x²m + 14xm - 10
_________________
32)
(x⁴+x²y²+y⁴).(x-y).(x+y)
= (x⁴+x²y²+y⁴).(x²-y²)
= x⁶- x⁴y² - x⁴y² + x²y⁴ + x²y⁴ - y⁶
= x⁶ - 2x⁴y² + 2x²y⁴ - y⁶
