Question

УПРОСТИТЕ -(9x-3)+(x-3) (x+3) -x*(5-x)=

Answer 1

-(9x-3)+(x-3)(x+3)-x*(5-x)=

=-9x+3+x²+3x-3x-9-5x+x²=

=2x²-14x-6

Answer 2

To simplify the expression, follow these steps:

1. Expand the brackets (using the distributive property).
2. Combine like terms.
3. Simplify further if possible.

Let's start with the given expression:

-(9x - 3) + (x - 3)(x + 3) - x(5 - x)

Step 1: Expand the brackets: -(9x - 3) = -9x + 3 (x - 3)(x + 3) = x^2 - 3x + 3x - 9 = x^2 - 9 -x(5 - x) = -x * 5 + x^2 = -5x + x^2

Now the expression becomes:

-9x + 3 + x^2 - 9 - 5x + x^2

Step 2: Combine like terms:

Group the terms with the same variable together:

(-9x - 5x) + (x^2 + x^2) + (3 - 9)

Combine the like terms:

-14x + 2x^2 - 6

Step 3: The expression is now simplified as:

2x^2 - 14x - 6

So, the simplified expression is 2x^2 - 14x - 6.