Question

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

Answer 1

12х+15-21-12х=15-21=-6.
(12х-12х=0).

Answer 2

12х+15-21-12х=-6. ....

Answer 3

Problem:

The given expression is 3(4x+5)-(21+12x). We need to simplify the expression by expanding the brackets and combining like terms.

Solution:

To simplify the expression, we will follow the order of operations, which is to perform any operations inside the brackets first, and then perform any multiplication or division from left to right, and finally perform any addition or subtraction from left to right.

Expanding the brackets: 3(4x+5) - (21+12x) = 3 * 4x + 3 * 5 - 21 - 12x

Simplifying the expression: = 12x + 15 - 21 - 12x

Combining like terms: = (12x - 12x) + (15 - 21) = 0x + (-6) = -6

Therefore, the simplified expression is -6.

Let me know if you need help with anything else.