Question

Номер 2 ( 3 и 5 ) и Номер 3 упрастите выражение . Заранее спасибо

Answer 1

$3) ={ (3x - 2y)}^{2} = (3x - 2y)(3x - 2y) \ 5) = - 7( {a}^{2} + 2ab + {b}^{2} ) = - 7(a + b)(a + b)$
$1) = {x}^{2} - 6x + 9 - ( {x}^{2} - x - 4x + 4) + {x}^{2} - 4 = {x}^{2} - 6x + 9 - {x}^{2} - 5x + 4 + {x}^{2} - 4 = {x}^{2} - 11x + 9$
$2) = (9 - {m}^{2} )(9 + {m}^{2} ) - ( {m}^{3} - 8) = 81 - {m}^{4} - {m}^{3} + 8 = 89 - {m}^{3} - {m}^{4}$