Question

найдите корни уравнения(6х-9)(4х+ 0.4)=0

Answer 1

6х-9=0 или 4х+0,4=0
6х=9. 4х=-0,4
х=1,1/3 Х=-0.1

Answer 2

$(6x-9)(4x+0,4)=0$
$24 x^{2} +2,4x-36x-3,6=0$
$24 x^{2} -33,6x-3,6=0$
$240 x^{2} -336x-36=0$
$40 x^{2} -56x-6=0$
$20 x^{2} -28x-3=0$
$D:784-4*20*(-3)=1024$
$x_{1} = \frac{28-32}{40}$
$x_{1} =- \frac{1}{10}$
$x_{2}= \frac{28+32}{40}$
$x_{2} = \frac{3}{2}$