решите тоже срочно:
(2х*-5х-7)(х-1)=0
* - квадрат
(2х^2-5х-7)(х-1)=0
х-1=0 или 2х^2-5х-7 = 0
x = 1 D = (-5)^2 - (-7) * 2 * 4 = 25 + 56 = 81>0
x1 = -(-5) + √81/4 = 5 + 9/4 = 3,5
x2 = -(-5) - √81/4 = 5 - 9/4 = -4/4 = -1
Ответ: 1; -1; 3,5.
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(2х^2-5х-7)(х-1)=0
х-1=0 или 2х^2-5х-7 = 0
x = 1 D = (-5)^2 - (-7) * 2 * 4 = 25 + 56 = 81>0
x1 = -(-5) + √81/4 = 5 + 9/4 = 3,5
x2 = -(-5) - √81/4 = 5 - 9/4 = -4/4 = -1
Ответ: 1; -1; 3,5.