Question

Раскрыть скобки привести, подобные: 3 (4x+5)- (21+12x

Answer 1

3 (4x+5)- (21+12x)=12х+15-21-12х=12х-12х+15-21=-6

Answer 2

Simplifying the Expression

To simplify the expression 3(4x+5) - (21+12x), we can follow the order of operations, which is commonly known as PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction).

1. Start by simplifying the expression within the parentheses: 4x+5.

2. Multiply the result from step 1 by 3: 3(4x+5).

3. Simplify the expression within the second set of parentheses: 21+12x.

4. Subtract the result from step 3 from the result from step 2: 3(4x+5) - (21+12x).

Let's go through each step in detail.

Step 1: Simplify the expression within the parentheses The expression within the first set of parentheses is 4x+5. There are no like terms to combine, so we leave it as it is.

Step 2: Multiply the result from step 1 by 3 Now, we multiply the result from step 1, which is 4x+5, by 3. This gives us 3(4x+5).

Step 3: Simplify the expression within the second set of parentheses The expression within the second set of parentheses is 21+12x. There are no like terms to combine, so we leave it as it is.

Step 4: Subtract the result from step 3 from the result from step 2 Finally, we subtract the result from step 3, which is 21+12x, from the result from step 2, which is 3(4x+5). This gives us the simplified expression:

3(4x+5) - (21+12x)

Let's calculate the simplified expression:

3(4x+5) - (21+12x) = 12x + 15 - 21 - 12x

Simplifying further, we can combine like terms:

12x - 12x + 15 - 21 = 0x - 6

Therefore, the simplified expression is -6.

Please let me know if you have any further questions!