Question

2) 100-(3a+7y)в квадрате ?​

Answer 1

$100-(3a+7y)^2=100-(9a^2+42ay+49y^2)=100-9a^2-42ay-49y^2$

Answer 2

To expand the expression (100 - (3a + 7y))^2, we can follow these steps:

Step 1: Distribute the square to the terms inside the parentheses: (100 - (3a + 7y)) * (100 - (3a + 7y))

Step 2: Apply the distributive property to both terms: 100 * 100 - 100 * (3a + 7y) - (3a + 7y) * 100 + (3a + 7y) * (3a + 7y)

Step 3: Simplify each term: 10,000 - 100 * 3a - 100 * 7y - 100 * 3a - 100 * 7y + (3a)^2 + 3a * 7y + 7y * 3a + 7y * 7y

Step 4: Combine like terms: 10,000 - 300a - 700y - 300a - 700y + 9a^2 + 21ay + 21ay + 49y^2

Step 5: Further simplify: 10,000 - 600a - 1400y + 9a^2 + 42ay + 49y^2

Therefore, the expanded form of (100 - (3a + 7y))^2 is 10,000 - 600a - 1400y + 9a^2 + 42ay + 49y^2.