Question

25-x2=21
2x2+3=3-7x
(6x+3)(9-x)=0
4x+2/3=2x-1
x(x-1)=5x

Answer 1

25-x²=21
x²=25-21
x²=4
x=-2
x=2

2x2+3=3-7x
2x²+7x=0
x(2x+7)=0
x=0  x=-3,5

(6x+3)(9-x)=0
x=-0,5  x=9

4x+2/3=2x-1
4x-2x=-2/3-1
2x=-1 2/3
x=-1 2/3:2=5/3*1/2=5/6
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(4x+2)/3=2x-1
4x-6x=-3-2=
-2x=-5
x=2,5

x(x-1)=5x
x²-x-5x=0
x(x-6)=0
x=0  x=6

Answer 2

$25-x^2=21to -x^2=21-25=-4 textless = textgreater x^2=4\x=б2$
Ответ: $б2$

$2x^2+3=3-7x textless = textgreater 2x^2+7x=0 textless = textgreater x(2x+7)=0$
$x=0$ или $2x+7=0to x=-frac{7}{2}=-3,5$
Ответ: $0;-3,5$

$(6x+3)(9-x)=0$
$6x+3=0to x=-frac{1}{2}=-0,5$ или $9-x=0to x=9$
Ответ: $9;-0,5$

$4x+frac{2}{3}=2x-1\2x=-1frac{2}{3}=-frac{5}{3}to x=-frac{5}{6}$
Ответ: $-frac{5}{6}$

$x(x-1)=5x textless = textgreater x^2-x=5xto x(x-6)=0$
$x=0$ или $x-6=0to x=6$
Ответ: $0;6$