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Question
which of the following is equivalent to 3a+4b - (-6a-3b)
A. 16ab
B. -3a + b
C. -3a + 7b
D. 9a + b
E. 9a + 7b
Please explain how you got the answer.
The 1st thing to do is to drop the parenthesis by applying the minus to both terms.
Since both of the terms inside are minus, giving 3a + 4b -- 6a -- 3b.
Since minus a minus means to add, it becomes 3a + 4b -- 6a -- 3b.
Next, combine like terms, so we have 3a + 6a + 4b + 3b.
That is (3+6)a + (4+3)b = 9a + 7b, and that can be seen to be in the list of choices.
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Scott A Wilson
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Any algebraic question you've got, like linear, quadratic, exponential, etc.
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solving story problems
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MS at math OSU in mathematics at OSU
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