Explicação passo a passo:
1
a
(2x +4)/ (2X + 4 )= 6/2x
em cruz
2x *( 2x +4 ) = 6 * ( 2X+4 )
4x² + 8x = 12X + 24
4X² +8X - 12X =24
+8X - 12X= - 4X>>>>
4X² -4X = 24
4X² -4X - 24 = 0 ( POR 4 )
X² - X - 6 = 0
a = +1
b = -1
c = -6
delta= b² - [ 4ac ] = ( -1 )² - ( 4 * 1 * 6 ) = 1 + 24 = 25 OU 5²
DELTA = +- v5² = +-5 >>>>>>
X = ( - b +- 5 )/2
x1 = ( 1 + 5 )/2 = 6/2 = 3 >>>>>resposta x1
x2 = ( 1 - 5 )/2 = -4/2 = - 2 >>>>>resposta x2
Aplicando o Teorema de Tales:
[tex]\frac{2x+4}{2x+4} = \frac{6}{2x} \\4x^{2} +8x=12x+24\\4x^{2} -4x-24=0\\b^{2} -4.a.c\\Delta= 400\\X'=3\\X"=-2\\\\\frac{x+1}{7-x} = \frac{4}{12} \\4(7-x)=12(x+1)\\28-4x=12x+12\\-4x-12x=12-28\\-16x=-16\\x=1[/tex]
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Explicação passo a passo:
1
a
(2x +4)/ (2X + 4 )= 6/2x
em cruz
2x *( 2x +4 ) = 6 * ( 2X+4 )
4x² + 8x = 12X + 24
4X² +8X - 12X =24
+8X - 12X= - 4X>>>>
4X² -4X = 24
4X² -4X - 24 = 0 ( POR 4 )
X² - X - 6 = 0
a = +1
b = -1
c = -6
delta= b² - [ 4ac ] = ( -1 )² - ( 4 * 1 * 6 ) = 1 + 24 = 25 OU 5²
DELTA = +- v5² = +-5 >>>>>>
X = ( - b +- 5 )/2
x1 = ( 1 + 5 )/2 = 6/2 = 3 >>>>>resposta x1
x2 = ( 1 - 5 )/2 = -4/2 = - 2 >>>>>resposta x2
Explicação passo a passo:
Aplicando o Teorema de Tales:
[tex]\frac{2x+4}{2x+4} = \frac{6}{2x} \\4x^{2} +8x=12x+24\\4x^{2} -4x-24=0\\b^{2} -4.a.c\\Delta= 400\\X'=3\\X"=-2\\\\\frac{x+1}{7-x} = \frac{4}{12} \\4(7-x)=12(x+1)\\28-4x=12x+12\\-4x-12x=12-28\\-16x=-16\\x=1[/tex]