Question

1) a) 2 · (a - 9) - 3;6) -3. (x + 2) + 10;B) 5. (4 - x) - (-5x + 1);​

Answer 1

Ответ:

Объяснение:

1) a) 2 · (a - 9) - 3=2а-18-3=2а-21

6) -3. (x + 2) + 10=-3х-6+10=-3х+4

B) 5. (4 - x) - (-5x + 1)=20-5х+5х-1=19

Answer 2

Let's simplify each expression step by step:

a) 2 · (a - 9) - 3:

First, distribute the 2 to the terms inside the parentheses: 2 · a - 2 · 9 - 3

Simplify the multiplication: 2a - 18 - 3

Combine like terms: 2a - 21

So, the simplified expression is 2a - 21.

b) -3(x + 2) + 10:

First, distribute the -3 to the terms inside the parentheses: -3x - 3 · 2 + 10

Simplify the multiplication: -3x - 6 + 10

Combine like terms: -3x + 4

So, the simplified expression is -3x + 4.

c) 5(4 - x) - (-5x + 1):

First, distribute the 5 to the terms inside the first set of parentheses: 20 - 5x - (-5x + 1)

Remember, when subtracting a negative, it becomes addition: 20 - 5x + 5x - 1

Combine like terms: (-5x + 5x) + (20 - 1)

The -5x and 5x cancel each other out: 0 + 19

So, the simplified expression is 19.