Question

In your notebook, set up the following subtraction in a vertical format and select the correct answer. Reduce 7y + 2y 2 - 7 by 3 - 4y.

Answer 1

2y^2 + 11y -10

Explanation:

Answer 2

In general reducing A by B means we subtract B from A.

Question says Reduce 7y + 2y^2 -7 by 3-4y

It means we subtract 3 - 4y from 7y + 2y^2 -7

We use vertical format for subtracting

First we arrange the terms

7y + 2y^2 -7 can be written as 2y^2 + 7y -7

3 - 4y can be written as 0y^2-4y +3

Now arrange one by one in vertical format and subtract. While subtracting we change the sign of bottom expression so 0y^2 -4y + 3 becomes -0y^2 + 4y -3

2y^2 + 7y -7

-0y^2+4y -3

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2y^2 + 11y -10

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