Question

(x-3)(x-7)-2x (3x-5)​

Answer 1

:::::::: решение ::::::::

Answer 2

To simplify the expression (x-3)(x-7) - 2x(3x-5), you can follow these steps:

Step 1: Expand each of the two terms in the expression:

(x-3)(x-7) = xx - x7 - 3x + 37 = x^2 - 7x - 3x + 21 = x^2 - 10x + 21

2x(3x-5) = 2x3x - 2x5 = 6x^2 - 10x

Step 2: Subtract the second expression from the first:

(x^2 - 10x + 21) - (6x^2 - 10x)

Step 3: Distribute the negative sign inside the second expression:

x^2 - 10x + 21 - 6x^2 + 10x

Step 4: Combine like terms:

(x^2 - 6x^2) + (-10x + 10x) + 21

Step 5: Perform the arithmetic operations:

-5x^2 + 0x + 21

The simplified expression is:

-5x^2 + 21