Question

1)(b-5)(7-5b)-2(b+2)(b-2)​

Answer 1

Ответ: 7b^2+32b-27

Объяснение:

7b-5b^2-35+25b-2(b^2-4)=

7b-5b^2-35+25b-2b^2+8=

32b-7b^2-27=

-7b^2+32b-27

Answer 2

To simplify the expression (b-5)(7-5b)-2(b+2)(b-2), we can expand the products and then combine like terms. Let's break it down step by step:

First, let's expand the product (b-5)(7-5b): (b-5)(7-5b) = b(7-5b) - 5(7-5b) = 7b - 5b^2 - 35 + 25b = -5b^2 + 32b - 35

Next, let's expand the product -2(b+2)(b-2): -2(b+2)(b-2) = -2b(b-2) - 2(2-2) = -2b^2 + 4b + 0 = -2b^2 + 4b

Now, let's substitute these expanded expressions back into the original expression and combine like terms: (b-5)(7-5b)-2(b+2)(b-2) = (-5b^2 + 32b - 35) - (-2b^2 + 4b) = -5b^2 + 32b - 35 + 2b^2 - 4b = -3b^2 + 28b - 35

Therefore, the simplified expression is -3b^2 + 28b - 35.