What expression must be subtracted from 3a - 2b - c to get a difference of 4a - 3b?
A.) a - b + c B.) -a + b - c C.) 7a - 5b - c D.) -7a + 5b + c
Similar to deciding what number must be subtracted from 7 to get a difference of 4, you could subtract 4 from 7 and find out it is 3.
In this one, subtract the difference of (4a - 3b) from (3a - 2b - c) (3a - 2b - c) - (4a - 3b) {subtracted} = 3a - 2b - c - 4a + 3b {removed parentheses, distributing negative sign} = -a + b - c {combined like terms} B.) -a + b - c Proof: (3a - 2b - c) - (-a + b - c) should equal (4a - 3b) = 3a - 2b - c + a - b + c {removed parentheses, distributing negative sign} = 4a - 3b {combined like terms} See more combining like terms examples here or Ask Algebra House Comments are closed.
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