Question

решите уравнение пж ( с решением)​

Answer 1

Ответ:

424

1 $3x^{2} -6x=x-4\\3x^{2}-7x+4=0\\D=49-4*3*4=1\\x1=(7-1)/6=1\\x2=(7+1)/6=8/6$

2

$x^{2}-2-3(1-x)=x-5\\x^{2} -5+3x-x+5=0\\x^{2} +2x=0\\x(x+2)=0\\x1=0\\x2= -2$

425

1

$2x^{2}-4x=x^{2} +2x+1-9\\x^{2} -6x+8=0\\D=36-4*8*1=4\\x1=(6+2)/2=4\\x2=(6-2)/4=1$

2

$5x^{2}-20x=x^{2} -16x+64-65\\4x^{2} -4x+1=0\\(2x-1 )^{2} =0\\\\x=0.5$

3

$2(x^{2} +4x+4)-3(x^{2} +2x+1)=6\\2x^{2} +8x+8-3x^{2} -6x-3-6=0\\-x^{2} +2x-1=0\\x^{2} -2x+1=0\\(x-1)^{2}=0\\x=1$

4

$5(x^{2} -2x+1)-4(x^{2} -4x+4)=80\\5x^{2} -10x+5-4x^{2} +16x-16-80=0\\x^{2} +4x+69=0\\D=16-4*69*1=-260$

Нет решения

Объяснение: