(3х-1)(3х+1)-2х(1+4х)=-2 Срочно решите

Question

(3х-1)(3х+1)-2х(1+4х)=-2 Срочно решите

Answer 1

( 3х - 1 ) ( 3х + 1 ) - 2х ( 1 + 4х ) = -2
9х² + 3х - 3х - 1 - 2х - 8х² = -2
9х² + 3х - 3х - 1 - 2х - 8х² + 2 = 0
х² + 2х + 1 = 0
Д = 4 - 4 × 1 × 1 = 4 - 4 = 0. 0 = 0
х = -2/2 = -1.
Ответ : х = -1.

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