2
Объяснение:
[ 15 / ( 8 + Х ) ] + [ 15 / ( 8 - X ) ] = 4
15 * ( 8 - X ) + 15 * ( 8 + X) = 4 * ( 64 - X^2 )
120 - 15X + 120 + 15X = 256 - 4X^2
4X^2 = 256 - 240
4X^2 = 16
X^2 = 4
X1 = 2
X2 = - 2 ( < 0 )
2
Объяснение:
[ 15 / ( 8 + Х ) ] + [ 15 / ( 8 - X ) ] = 4
15 * ( 8 - X ) + 15 * ( 8 + X) = 4 * ( 64 - X^2 )
120 - 15X + 120 + 15X = 256 - 4X^2
4X^2 = 256 - 240
4X^2 = 16
X^2 = 4
X1 = 2
X2 = - 2 ( < 0 )