Question

Me ajudem PFVR

Efetue as operações indicadas
A)(2x3-3x2+x-1)+(5x3+6x2-7x+3)
B)(2ax3-5a2x-4by)+(5ax3+7a2x+6by)

Calcule:
A) (+5x).(-4x2)
B)(-2x).(+3x)
C)(+5x).(+4x)
D)(-n).(+6n)
É)(-6x²).(+3x²)
F)(-2y).(5y)
G)(+4x²).(+5x³)
H)(2y).(-7x)

Answer 1

A)(2x3-3x2+x-1)+(5x3+6x2-7x+3) = (6 - 6 + x - 1) + (15 + 12 + 3 - 7x) = x - 1 + 30 - 7x = -6x + 29
B) (2ax³ - 5a²x - 4by) + (5ax³ + 7a²x + 6by) = 2ax³ + 5ax³ - 5a²x + 7a²x - 4by + 6by = 7ax³ + 2a²x + 2by = ax (7x² + 2a) + 2by

A) (+5x).(-4x²) = (5) * (-4) * x * x² = -20x³
B)(-2x).(+3x) = (-2) * (3) * x * x = -6x²
C)(+5x).(+4x) = 20x²
D)(-n).(+6n) = -6n² 
É)(-6x²).(+3x²) = -18 x^4
F)(-2y).(5y) = -10y²
G)(+4x²).(+5x³) = 20x^5
H)(2y).(-7x) = -14xy