Question

(c+b)(c-b)-(5c²-b²)=​

Answer 1

Ответ:

Объяснение:

(c+b)(c-b)-(5c²-b²)=c²-b²-5c²+b²=-4c².

Answer 2

Let's simplify the expression step by step:

1. Expand the terms within the first parentheses: (c + b)(c - b) = c^2 - cb + cb - b^2

2. The middle terms cancel out (cb and -cb): c^2 - b^2

3. Now, we can substitute the expression obtained in step 2 into the original expression: (c + b)(c - b) - (5c^2 - b^2) = c^2 - b^2 - (5c^2 - b^2)

4. Distribute the negative sign in the second parentheses: c^2 - b^2 - 5c^2 + b^2

5. Combine like terms: (c^2 - 5c^2) + (b^2 - b^2) = -4c^2

So, the simplified expression is -4c^2.