Question

(b-3)(b+3)-(b+2)^2 срочно

Answer 1

Ответ:

(b-3)(b+3)-(b+2)^2=b^2-9-b^2-4b-4=-4b-13

Answer 2

Sure, let's simplify the expression step by step:

Expression: (b-3)(b+3) - (b+2)^2

Step 1: Expand the first parentheses using the FOIL method (First, Outer, Inner, Last): (b-3)(b+3) = bb + b3 - 3b - 33 = b^2 + 3b - 3b - 9 = b^2 - 9

Step 2: Expand the second parentheses: (b+2)^2 = (b+2)(b+2) = bb + b2 + 2b + 22 = b^2 + 2b + 2b + 4 = b^2 + 4b + 4

Now, the simplified expression becomes: (b-3)(b+3) - (b+2)^2 = (b^2 - 9) - (b^2 + 4b + 4)

Step 3: Distribute the negative sign in the second parentheses: (b^2 - 9) - (b^2 + 4b + 4) = b^2 - 9 - b^2 - 4b - 4

Step 4: Combine like terms: (b^2 - b^2) + (-4b) + (-9 - 4) = -4b - 13

The simplified expression is: -4b - 13

If you have any more questions or need further assistance, feel free to ask!