Question

Уравнение (x-3)(x-7)-2x(3x-5)

Answer 1

Ответ:

-5x(в квадрате)+21

Пошаговое объяснение:

Answer 2

To simplify the given expression, let's first expand it step by step:

1. Start with the given expression: (x-3)(x-7) - 2x(3x-5)

2. Expand the first bracket (x-3)(x-7): (x-3)(x-7) = x*x - 7x - 3x + 21 = x^2 - 10x + 21

3. Expand the second bracket -2x(3x-5): -2x(3x-5) = -2x3x + 2x5 = -6x^2 + 10x

4. Now, substitute the expanded forms back into the original expression: (x^2 - 10x + 21) - (-6x^2 + 10x)

5. Simplify by combining like terms: x^2 - 10x + 21 + 6x^2 - 10x

6. Combine the x^2 and x terms: (x^2 + 6x^2) + (-10x - 10x)

7. Simplify further: 7x^2 - 20x + 21

So, the simplified expression is 7x^2 - 20x + 21.