Question

решите уравнения (5х-4)(х+2)=0

Answer 1

(5х-4)=0 ; x=4/5 =0.8
или
(х+2)=0 ; x= -2
ОТВЕТ  x = {-2 ; 0.8}

Answer 2

5x^2 + 10x - 4x - 8 = 0

5x^2+6x-8=0
D=196
sqrt (196) = 14

x1 = (-10 + 14)/10=0,4
x2 = (-10 - 14)/10=-2,4