Question

(2c-5)^2-(2x-3)(2x+3)

Answer 1

$(2c-5)^2-(2x-3)(2x+3)=4c^2-20c+25-(2x-3)(2x+3)$ $=4c^2-20c+25+(-2x+3)(2x+3)=$ $=4c^2-20c+25-4x^2-6x+6x+9=4c^2-20c+34-4x^2$ $=4c^2-4x^2-20c+34$

Answer 2

=2с^2-20с+25-4х^2-6х+6х+9=2с^2-20с+34-4х^2
неверно так

Answer 3

To simplify the expression (2c-5)^2 - (2x-3)(2x+3), let's expand and simplify it step by step:

First, let's expand (2c-5)^2: (2c-5)^2 = (2c-5)(2c-5) = 4c^2 - 10c - 10c + 25 = 4c^2 - 20c + 25

Next, let's expand (2x-3)(2x+3) using the FOIL method: (2x-3)(2x+3) = 2x * 2x + 2x * 3 - 3 * 2x - 3 * 3 = 4x^2 + 6x - 6x - 9 = 4x^2 - 9

Now, substitute the expanded forms back into the original expression: (2c-5)^2 - (2x-3)(2x+3) = (4c^2 - 20c + 25) - (4x^2 - 9) = 4c^2 - 20c + 25 - 4x^2 + 9 = 4c^2 - 4x^2 - 20c + 34

So, the simplified form of (2c-5)^2 - (2x-3)(2x+3) is 4c^2 - 4x^2 - 20c + 34.