Question

Помогите с алгеброй
x^2-7x^2+14x-5=0

Answer 1

$2x - 7x \times 2 + 14x - 5 = 0 \\ 2x - 14x + 14x - 5 = 0 \\ 2x - 5 = 0 \\ 2x = 5 \\ x = \frac{5}{2} \\ x = 2.5$

Answer 2

$x^{2} -7x^{2} +14x-5=0$

$-6x^{2} +14x - 5=0$

$6x^{2} -14x + 5=0$

$D=196-120=76$

$x=(14+-\sqrt{76} )/ 12$

$x=(14+-2\sqrt{19} )/ 12$

$x=2(7+- \sqrt{19} )/12$

$x=(7+- \sqrt{19} )/6$