Question

1. Com as letras A, B e C, vamos indicar esses polígonos:
A = x + 2; B = 2x - 5; C = 3x + 4
Agora, calcule:
a) A- BC b) B + AC c) C - AB​

Answer 1

Resposta :

A) A - BC

( x+2 ) - (( 2X - 5 ) . ( 3X+4 ))

( x+2 ) - ( 6x^2 + 8X - 15X - 20 )

X + 2 - 6x^2 + 7X + 20

-6x^2 + 8X + 22

B) B + AC

( 2x - 5 ) + (( x + 2 ) . ( 3x + 4 )

( 2X - 5 ) + ( 3x^2 + 4X + 6X + 8 )

2X - 5 + 3x^2 + 10X + 8

3x^2 + 12X + 3

C) C - AB​

( 3x + 4 ) - (( x + 2 ) . ( 2x - 5 ))

( 3X + 4 ) - ( 2x^2 - 5X + 4X -10 )

3X + 4 - 2x^2 + 5X - 4X + 10

- 2x^2 + 4X + 14