Question

Решите уравнение:
а) 2х+1=3х-4 б) (х-5)(2х-7)=0

Answer 1

А) 2х+1=3x-4
    2x-3x=-1-4
    -1x=-3
    x=3

Answer 2

x-10x-7=0

Answer 3

-9x-7=0

Answer 4

-9x=0=7

Answer 5

x= 7 : 9

Answer 6

а) 2х+1=3х-4
2х-3х= 4-1
-х=3
х=-3
б)(х-5)(2х-7)=0
2х^2-7х-10х+35=0
2х^2-17х+35=0
D= (-17^2)-70*4=289-280=9
х1= (17+√9)/4=5
х2=(17- √9)/4=3,5