Составьте приведённое квадратное уравнение, сумма корней которого равна –10, а произведение — числу 8.
Диагональ прямоугольника на 8 см больше одной из
его сторон и на 4 см больше другой. Найдите стороны
прямоугольника.
monorag r2 +7х + c = 0.​

- 4*( - x + 7 ) = x + 17 
4x - 28 = x + 17 
3x = 45 
x = 15 

c - 32 = - 7 * ( c + 8 ) 
c - 32 = - 7c - 56
8c = - 24 
c = - 3 

3 * ( 4x - 8 ) = 3x - 6 
12x - 24 = 3x - 6 
9x = 18 
x = 2 

5 * ( x - 7 ) = 3 * ( x - 4 ) 
5x - 35 = 3x - 12 
2x = 23 
x = 11,5 

4 * ( x - 3 ) - 16 = 5 * ( x - 5 ) 
4x - 12 - 16 = 5x - 25 
4x - 28 = 5x - 25 
x = - 3 

8 * ( 2a - 6 ) = 2 * ( 4a + 3 ) 
16a - 48 = 8a + 6 
8a = 54 
a = 6,75 

- 4 * ( 3 - 5x ) = 18x - 7 
- 12 + 20x = 18x - 7 
2x = 5 
x = 2,5 

6a + ( 3a - 2 ) = 14 
6a + 3a - 2 = 14 
9a = 16 
a = 1 ( 7/9 )

8x - ( 7x - 142 ) = 51 
8x - 7x + 142 = 51 
x = - 91

Simplifying

4x3 + -81x = 0

Reorder the terms:

-81x + 4x3 = 0

Solving

-81x + 4x3 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), 'x'.

x(-81 + 4x2) = 0

Factor a difference between two squares.

x((9 + 2x)(-9 + 2x)) = 0

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve:

Simplifying

x = 0

Solving

x = 0

Move all terms containing x to the left, all other terms to the right.

Simplifying

x = 0

Subproblem 2

Set the factor '(9 + 2x)' equal to zero and attempt to solve:

Simplifying

9 + 2x = 0

Solving

9 + 2x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-9' to each side of the equation.

9 + -9 + 2x = 0 + -9

Combine like terms: 9 + -9 = 0

0 + 2x = 0 + -9

2x = 0 + -9

Combine like terms: 0 + -9 = -9

2x = -9

Divide each side by '2'.

x = -4.5

Simplifying

x = -4.5

Subproblem 3

Set the factor '(-9 + 2x)' equal to zero and attempt to solve:

Simplifying

-9 + 2x = 0

Solving

-9 + 2x = 0

Move all terms containing x to the left, all other terms to the right.

Add '9' to each side of the equation.

-9 + 9 + 2x = 0 + 9

Combine like terms: -9 + 9 = 0

0 + 2x = 0 + 9

2x = 0 + 9

Combine like terms: 0 + 9 = 9

2x = 9

Divide each side by '2'.

x = 4.5

Simplifying

x = 4.5

Solution

x = {0, -4.5, 4.5}