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juliatgoulart
@juliatgoulart
March 2022
2
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Resolva a expressão:
(2x+2)
²
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GFerraz
Pelo trinômio quadrado perfeito:
(a + b)² = a² + 2.a.b + b²
(2x + 2)² = (2x)² + 2.2x.2 + 2²
= 4x² + 8x + 4
Logo:
(2x + 2)² = 4x² + 8x + 4
1 votes
Thanks 2
juliatgoulart
OBG!
laion97
Vc pode fazer através do famoso chuveirinho que seria (2x+2)x(2x+2) que fica
4x²+4x+4x+4
4x²+8x+4=0 (:4)
x²+2x+1=0
joga em bháskara
a = 1
b = 2 delta = 4 -4 =0 x1 + x2 = -2 +0 /2 = -1 e -2 -0 /2 = 1
c = 1
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Lista de comentários
(a + b)² = a² + 2.a.b + b²
(2x + 2)² = (2x)² + 2.2x.2 + 2²
= 4x² + 8x + 4
Logo:
(2x + 2)² = 4x² + 8x + 4
4x²+4x+4x+4
4x²+8x+4=0 (:4)
x²+2x+1=0
joga em bháskara
a = 1
b = 2 delta = 4 -4 =0 x1 + x2 = -2 +0 /2 = -1 e -2 -0 /2 = 1
c = 1