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2a² - 5a - 3a + 9a
2a² - 8a + 9
(2x - 3)(x - 3)
b)
x² + 3x + 2 - 4x² + 2x - 7
- 3x² + 5x - 5
(3x + 5)(x - 1)
c)
5m² + 10m - 4m² + 2m
m² + 12m
m(m + 12)
(2a²-5a)-(3a-9a)
=2a²-5a-3a+9a
=2a²-8a+9a
=2a²+a
b.(x²+3x+2)-(4x²+2x-7)
=x²-4x²+3x-2x+2+7
=-3x²+x+9
c.(4m²+2m)-(5m²+10n)
(5m²+10n)-(4m²+2m)
=m²+10n-2m