Question

7 (3 b 2 + 7b ) - 7 (-8b 2 + 3 b ) решите плиз

Answer 1

7•(3b•2+7b)-7(-8b•2+3b)=7•(13b)-7•(-13b)=91b+91b=182b

Answer 2

To solve the expression, let's simplify it step by step:

1. Distribute the 7 to the terms inside the first parentheses: 7 * (3b^2 + 7b) = 21b^2 + 49b

2. Distribute the -7 to the terms inside the second parentheses: -7 * (-8b^2 + 3b) = 56b^2 - 21b

Now, we have the simplified expression: 21b^2 + 49b - (56b^2 - 21b)

Next, let's combine like terms by adding and subtracting the coefficients of the same degree terms:

21b^2 + 49b - 56b^2 + 21b

Combine the b^2 terms: (21b^2 - 56b^2) = -35b^2

Combine the b terms: (49b + 21b) = 70b

Now, the expression becomes: -35b^2 + 70b

So the simplified expression is: -35b^2 + 70b