Respuesta:
8 ) x = 6
9 ) x = 9 / 4
10 ) x = - 6
Explicación paso a paso:
8 )
20 - ( x + 5 ) = 3 ( x - 3 )
20 - x - 5 = 3x - 9
20 - 5 - x = 3x - 9
15 - x = 3x - 9
15 + 9 = 3x + x
24 = 4x
x = 24 / 4
x = 6
9 )
18 + ( x - 4 ) = 5 ( x + 1 )
18 + x - 4 = 5x + 5
18 - 4 + x = 5x + 5
14 + x = 5x + 5
14 - 5 = 5x - x
9 = 4x
x = 9 / 4
10 )
( x + 6 ) ( x + 3 ) = x ( x + 8 ) - 3
x ( x + 3 ) + 6 ( x + 3 ) = x^2 + 8x - 3
x^2 + 3x + 6x + 3 = x^2 + 8x - 3
x^2 + 9x + 3 = x^2 + 8x - 3
x^2 - x^2 + 9x - 8x = - 3 - 3
0 + x = - 6
x = - 6
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Verified answer
Respuesta:
8 ) x = 6
9 ) x = 9 / 4
10 ) x = - 6
Explicación paso a paso:
8 )
20 - ( x + 5 ) = 3 ( x - 3 )
20 - x - 5 = 3x - 9
20 - 5 - x = 3x - 9
15 - x = 3x - 9
15 + 9 = 3x + x
24 = 4x
x = 24 / 4
x = 6
9 )
18 + ( x - 4 ) = 5 ( x + 1 )
18 + x - 4 = 5x + 5
18 - 4 + x = 5x + 5
14 + x = 5x + 5
14 - 5 = 5x - x
9 = 4x
x = 9 / 4
10 )
( x + 6 ) ( x + 3 ) = x ( x + 8 ) - 3
x ( x + 3 ) + 6 ( x + 3 ) = x^2 + 8x - 3
x^2 + 3x + 6x + 3 = x^2 + 8x - 3
x^2 + 9x + 3 = x^2 + 8x - 3
x^2 - x^2 + 9x - 8x = - 3 - 3
0 + x = - 6
x = - 6