What is -3x plus 25 plus x plus 21 2?

Answer 1

-2x +67.

1) -3x + 25 + x + (21)(2)

2) -2x + 25 + (21)(2).

3) -2x + 25 + 42

4) -2x +67.

Step 1: The first thing we want to do with an algebraic expression like this is combine all of the common variables together. If it helps, you can reorder the terms, making it -3x + x + 25+ (21)(2). Adding these variables gets us -3x + x = -2x.

Explanation:

(The 3 in 3x just signifies there are 3 xs. It can also be written (-x - x - x) + x ) Variables can be added together like any other number if they have a common base (x) and the same exponent (Since there is no exponent on either, they are both one. If you haven't covered exponents yet, ignore this). So, -3 + 1 = -2.

Step 2:

Now we have -2x + 25 + (21)(2). Next, we will multiply or divide. (order of operations: PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction, carried out after dealing with the variables.) I am not sure if 21 2 means (21)(2), 21 times 2, so I will assume it is unless you update the question. If it does, multiply them together to get 42.

Step 3:

Now you have -2x + 25 + 42. The next step is addition/subtraction. So, add together 25 and 42. 25 + 42 = 67. Variables and cannot be added with non-variables, so this was our last step.

We are now left with the answer, -2x +67.