October 2020 1 185 Report
1) Calcule a subtração a seguir e marque a alternativa correta:
(3x²- 6x + 4) - (2x² + 4x – 7)
a) 5x²+ 2x - 3
b) 5x²- x - 3
c) 5x²- 2x + 3
d) x²- 10x - 1
e) x²- 10x – 3
02) Qual das expressões abaixo resulta em 0 (zero)?a) (4x-y-1)-(9x+y+3) 
b) (-2a²-3ª+6)-(-4a²-5ª+6) 
c) (4x³-6x²+3x)-(7x³-6x²+8x) 
d) (x²-5x+3)-(4x²+6) 
e) (x²+2xy+y²)-(y²+x²+2xy)


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