Question

(x-3)(x + 3) -x(x-4);​

Answer 1

Відповідь: 4х-9.

Покрокове пояснення:

(x-3)(x + 3) -x(x-4)=

х²-9-х²+4х=4х-9

Answer 2

To simplify the expression (x - 3)(x + 3) - x(x - 4), you can follow these steps:

1. Expand both terms:

   (x - 3)(x + 3) = x(x) + x(3) - 3(x) - 3(3) = x^2 + 3x - 3x - 9

   x(x - 4) = x(x) - x(4) = x^2 - 4x

2. Now, subtract the second term from the first term:

   (x^2 + 3x - 3x - 9) - (x^2 - 4x)

3. Simplify the expression further:

   x^2 + 3x - 3x - 9 - x^2 + 4x

4. Combine like terms:

   (x^2 - x^2) + (3x - 3x + 4x) - 9

5. Simplify:

   0 + 4x - 9

6. Finally, simplify it to:

   4x - 9

So, (x - 3)(x + 3) - x(x - 4) simplifies to 4x - 9.