Question

Решите плиз x(10x-14)=9

Answer 1

$x(10x-14)=9 \\ 10 x^{2} -14x-9=0 \\ D=196+360=556 \\ \sqrt{D} = \sqrt{556}$

$x_{1} = \frac{14+ \sqrt{556} }{20} \\ x_{2} = \frac{14- \sqrt{556} }{20}$

Answer 2

10x^2-14x-9=0
D= 556
x_1,x_2= 14+-sqrt(556)/20