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Todas as categorias

7 respostas

Cara Isabella :

Não esqueça que (x+y)² = x² +2xy + y² ; ( x-y)² = x² - 2xy + y² ,ok?

Agora vamos por partes :

I)
(2a-6)² = (2a)² - 2.2a.6 + 6² = 4a² - 24 a + 36

II)
(- 2a+5)² =(-2a)² + 2.(-2a).5 + 5² =

= 4a² - 20a + 25

Então , I) - II) :

4a² - 24a + 36 - ( 4a² - 20a + 25 ) =

= 4a² - 24a + 36 - 4a² + 20a - 25 =

= - 4a + 11

Um abraço !!

2007-01-29 00:57:28 · answer #1 · answered by Carlos Homero Gonçalves Carrocin 6 · 0 0

4a² - 24a+36-4a²+20a-25=0
cancela-se +4a²-4a²
-24a+20a= -4a
36-25=11
-4a+11=0
a=-11/-4
a=11/4

2007-01-28 14:41:13 · answer #2 · answered by Vera Lúcia 3 · 0 0

Não sei dá -4a - 11 ou -4a + 11

hauhuahuahua
mas o que vale é a intenção né !

2007-01-28 14:26:13 · answer #3 · answered by Andrade 3 · 0 0

(4a²+36) - (4a²+25)
4a²+36-4a²-25
=11

leva-se os nºs ao quadrado, depois elimiman-se os 4a² e diminui 25 do 36. OK?

2007-01-28 14:14:15 · answer #4 · answered by edwaldo r 3 · 0 0

4a*2-24a+36 - [4a*2-20a+25] =

4a*2-24a+36 - 4a*2 + 20a - 25 =

= -4a+11

2007-01-28 14:11:09 · answer #5 · answered by Anonymous · 0 0

-4a+11

2007-01-28 13:55:48 · answer #6 · answered by ninjagaiden777 3 · 0 0

-1

2007-01-28 13:46:36 · answer #7 · answered by Juma 6 · 0 0

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