Question

7x²= – 2х

x²-7x-18=0​

Answer 1

Respuesta:

1)

7x²= – 2х

7x²+ 2х = 0

x(7x+2)=0

x1=0 ; 7x+2=0

7x= -2

x2 = -2/7

2)

x²-7x-18=0

(x-9)(x+2)=0

x-9=0 ; x+2=0

x1=9 ; x2=-2