Т.к. 5 - корень уравнение, то верно равенство
c*5² + 5 + 4 = 0
25c = -9
c = -0,36
Ответ:
1)7х-5 = 3х+1
7х-3х = 1+5
4х = 6
<u>х = 1,5</u>
2)6х-2 = 4х+6
6х-4х = 6+2
2х = 8
<u>х = 4</u>
3)9х = 7+8
9х = 15
<u>х = 15/9 = 5/3 = 1 2/3</u>
4)х-6 = 2х+8
х-2х = 8+6
-х = 14
<u>х = -14</u>
5)11х-5 = 20х+20
11х-20х = 20+5
-9х = 25
<u>х = -(25/9) = -2 7/9</u>.
1)7ab-14b²=7b(a-2b)
2)(3a)³x²+(6a)²x³-(9a)³=3a²(ax²+2x³-3a)
3)a(3b+c)-x(3b+c)=(3b+c)(a-x)
А^2 - b^2 + 3( a - b )^2 = ( a - b )( a + b ) + 3( a - b )^2 = ( a - b )( a + b + 3a - 3b ) = ( a - b )( 4a - 2b )