The machine adds one expression to whatever goes in. Which expression must it add so that 3a − 2b + 5 comes out as a + 4b − 1?

Question

Accepted Answer

−2a + 6b − 6. What to add = output - input = (a + 4b - 1) - (3a - 2b + 5) = -2a + 6b - 6. Input minus output gives 2a - 6b + 6; adding them gives 4a + 2b + 4; 4b - (-2b) = 6b, not 2b.

The machine adds one expression to whatever goes in. Which expression must it add so that $3 a - 2 b + 5$ comes out as $a + 4 b - 1$ ?

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More Class 7 Adding and Subtracting Expressions practice

The machine adds one expression to whatever goes in. Which expression must it add so that 3a−2b+5 comes out as a+4b−1?

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 7 Adding and Subtracting Expressions practice

The machine adds one expression to whatever goes in. Which expression must it add so that $3 a - 2 b + 5$ comes out as $a + 4 b - 1$ ?