допоможіть (2х+6)(7-4х)=(2-х)(8х+1)+15. Created by plesmarina. algebra-ru

допоможіть (2х+6)(7-4х)=(2-х)(8х+1)+15...

plesmarina @plesmarina

July 2022 2 8 Report

допоможіть
(2х+6)(7-4х)=(2-х)(8х+1)+15

amazonka007 $14x-8 x^{2} +42-24x=16x+2-8 x^{2} -x+15 \\ -10x+42=15x+17 \\ -25x=-25 \\ x=1$

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PoloMaster (2x+6)(7x-4x)=(2-x)(8x+1)+15
14x2-8x2+42x-24x=16x+1-8x2-x+15
14x2-8x2+42x-24x-16x-1+8x2+x-15
-2x2+3x-14=0
D=b2-4ac=9-4*-2*-14=-103
D<0,следовательно нет решения

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