1) х(х+3)=10 2)х(х-1)=42 3)(х+7)х=18 4)(х-9)х=36

Предыдущий
вопрос Следующий
вопрос

1) x(x+3) = 1
Expanding the left side
x^2 + 3x = 1
Subtracting 10 from both sides
x^2 + 3x - 10 =
Factoring the quadratic equation
(x + 5)(x - 2) =
Setting each factor to zero
x + 5 = 0 or x - 2 =
x = -5 or x = 2

2) x(x-1) = 4
Expanding the left side
x^2 - x = 4
Subtracting 42 from both sides
x^2 - x - 42 =
Factoring the quadratic equation
(x - 7)(x + 6) =
Setting each factor to zero
x - 7 = 0 or x + 6 =
x = 7 or x = -6

3) (x+7)x = 1
Expanding the left side
x^2 + 7x = 1
Subtracting 18 from both sides
x^2 + 7x - 18 =
Factoring the quadratic equation
(x + 9)(x - 2) =
Setting each factor to zero
x + 9 = 0 or x - 2 =
x = -9 or x = 2

4) (x-9)x = 3
Expanding the left side
x^2 - 9x = 3
Subtracting 36 from both sides
x^2 - 9x - 36 =
Factoring the quadratic equation
(x - 12)(x + 3) =
Setting each factor to zero
x - 12 = 0 or x + 3 =
x = 12 or x = -3