Question

2) (2a - 2)2 = 4a² - 28ab + 49b² 3) (x + 9n) = 36m² + 108mn +81n²4) (x - 6b)² = 64a²-96ab + 36b²​

Answer 1

Ответ:

я думаю вариант 3 правилный

Answer 2

Let's verify each of the given expressions:

1. (2a - 2)²

To simplify this expression, we'll use the formula for the square of a binomial: (a - b)² = a² - 2ab + b².

In this case, a = 2a and b = 2:

(2a - 2)² = (2a)² - 2(2a)(2) + 2² = 4a² - 8a + 4

2. 4a² - 28ab + 49b²

This expression is already given to us.

3. (x + 9n)²

Using the formula for the square of a binomial: (a + b)² = a² + 2ab + b².

In this case, a = x and b = 9n:

(x + 9n)² = x² + 2(x)(9n) + (9n)² = x² + 18xn + 81n²

4. (x - 6b)²

Using the formula for the square of a binomial: (a - b)² = a² - 2ab + b².

In this case, a = x and b = 6b:

(x - 6b)² = x² - 2(x)(6b) + (6b)² = x² - 12xb + 36b²

The correct expressions are:

1. (2a - 2)² = 4a² - 8a + 4
2. 4a² - 28ab + 49b²
3. (x + 9n)² = x² + 18xn + 81n²
4. (x - 6b)² = x² - 12xb + 36b²