Question

(x +6)(x -3) -(x +3)(x +9) 9

Answer 1

Вот ,вроде бы правильно

Answer 2

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

Step 1: Expand (x + 6)(x - 3): (x + 6)(x - 3) = x * x + x * (-3) + 6 * x + 6 * (-3) = x^2 - 3x + 6x - 18 = x^2 + 3x - 18

Step 2: Expand (x + 3)(x + 9): (x + 3)(x + 9) = x * x + x * 9 + 3 * x + 3 * 9 = x^2 + 9x + 3x + 27 = x^2 + 12x + 27

Now, we have the following expression: (x + 6)(x - 3) - (x + 3)(x + 9) + 9

Substitute the expanded forms: = (x^2 + 3x - 18) - (x^2 + 12x + 27) + 9

Now, let's combine like terms:

= x^2 + 3x - 18 - x^2 - 12x - 27 + 9

Next, simplify the expression by combining like terms:

= (x^2 - x^2) + (3x - 12x) + (-18 - 27) + 9 = 0 - 9x - 45 + 9 = -9x - 36

So, the final simplified expression is: -9x - 36.