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8 respostas

Esta equãção não é do primeiro grau e sim do segundo.

x2 + 14x + 49 + 200 = x2 -6x +9 + 40
20x = -249 + 49
20x = -200
x = -10

2006-10-21 13:57:02 · answer #1 · answered by Dud's 4 · 0 1

Esta é bem simples:
lembre-se desta regra: (a+b)² = a² + 2.a.b + b²

x² + 2.x.7 + 7² + 200 = x² - 2.x.3 + 3² + 40
x² + 14.x + 49 + 200 = x² - 6.x + 9 + 40
x² + 14.x + 249 = x² - 6.x + 49
x² + 14.x + 249 - x² + 6.x - 49 = 0
20.x + 200 = 0
20.x = -200
x = -200/20
x = -10

2006-10-21 14:10:02 · answer #2 · answered by Fernando 1 · 1 0

(x+7)²+200=(x-3)²+40
x² + 14x + 49 + 200 = x² - 6x + 9 + 40
x² - x² + 14x + 6x = 49 – 49 – 200
20x = -200
x = -200 / 20
x = - 10

2006-10-21 14:04:25 · answer #3 · answered by Paulo C 2 · 1 0

(x+7)²+200 = (x-3)2+40
x² + 14x +49 +200 = x² - 6x + 9 + 40
x² + 14 x + 249 = x² - 6 x + 49
x² - x² + 14 x + 6 x = -249 + 49
20 x = - 200
x= -10

2006-10-21 14:03:15 · answer #4 · answered by Chris =D 3 · 1 0

x²+14x+49+200=x²-6x+9+40
x²+14x+249-x²+6x-49=0
20x+200=0
x=-200/20
x=-10

2006-10-21 14:00:07 · answer #5 · answered by Rogério R 2 · 1 0

Ebenezer, vc eh tao esperto!!!

(x²+14x+49)+200=(x²-6x+9)+40
x²+14x+249=x²-6x+49

tira o x² (aqui fica sendo do primeiro grau)

14x+249=-6x+49

coloca os numero com "x" de um lado, e os numero sem "x" do outro lado

14x+6x=49-249
20x=-200
x=-200/20
x=-10

Dez negativo eh a resposta!

2006-10-21 13:59:59 · answer #6 · answered by zandree_mg 2 · 1 0

(x+7)²+200=(x-3)²+40
(x+7)² - (x-3)²+200 =40
(x²+49) -(x²-9) +200=40
2x²-40+200 =240
2 x²-160=240
2x²= 240+160
x²= 300/2
x² = 150

2006-10-23 16:46:46 · answer #7 · answered by anônimo 3 · 0 0

x²+ 14x+ 49+ 200 = x²- 6x+ 9+ 40
20x = -200
x = -10

2006-10-21 14:00:13 · answer #8 · answered by Illusional Self 6 · 0 0

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