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How do you combine #(3-r) + (4+5r) + (2r-1)#?

Answer 1

Avery Alexander

The answer is #6r+6#.

#(3-r)+(4+5r)+(2r-1)#

Do what's in each set of parentheses first.

#3-r+4+5r+2r-1# =

Combine like terms and add or subtract from left to right.

#-r+5r+2r+3+4-1# =

#6r+6#

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Answer 2

Eli Assouline

To combine the expressions (3-r), (4+5r), and (2r-1), you simply add their like terms together. Start by combining the constants (numbers without variables), then combine the terms with the same variable.

(3-r) + (4+5r) + (2r-1)

First, combine the constants: 3 + 4 - 1 = 6

Next, combine the terms with the variable 'r': (-r) + 5r + 2r = 6r

So, the expression becomes: 6 + 6r

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.