Question

Observe os polinomios a seguir A=×+2× -1 B=3×-7×+3 C = 2x -5× -1 .Determine =a+b-c

Answer 1

De ínicio:

A = x + 2x – 1 = 3x – 1
B = 3x – 7x + 3 = – 4x + 3
C = 2x – 5x – 1 = – 3x – 1

Então A + B – C será:

A + B – C = 3x – 1 + (– 4x + 3) – (– 3x – 1)

A + B – C = 3x – 1 – 4x + 3 + 3x + 1

A + B – C = 3x – 4x + 3x – 1 + 3 + 1

A + B – C = – x + 3x + 3

A + B – C = 2x + 3

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