Question

Розв'яжiть рiвняння: (5+x)(4-x)- (4 + x )( 3 - x )=2-x;
срочно​

Answer 1

Ответ:

$(5 + x)(4 - x) - (4 + x)(3 - x) = 2 - x$

$20 - 5 + 4x - {x}^{2 } - (12 - 4x + 3x - {x}^{2} ) = 2 - x$

$20 - 5x + 4x - {x}^{2} - (12 - x - {x}^{2} ) = 2 - x$

$20 - 5x + 4x - {x}^{2} - 12 + x + {x}^{2} = 2 - x$

$8 + 0 = 2 - x$

$8 = 2 - x$

$x = 2 - 8$

$x = - 6$