Question

Ella simplifies (3 b + 4 r) + (negative 2 b minus r) and says the result is b Plus 5r. What error did Ella make?

Answer 1

Answer and step-by-step explanation:

So Ella starts out with with the equation:

(3b + 4r) + (-2b - r)

and results in b + 5r.

Let's solve for ourselves to see what Ella did wrong.

3b + 4r - 2b - r

4r - r = 3r

3b - 2b = b

b + 3r

Answer 2

Answer and Step-by-step explanation:

So Ella starts out with with the equation:

(3b + 4r) + (-2b - r)

and results in b + 5r.

Let's solve for ourselves to see what Ella did wrong.

3b + 4r - 2b - r

4r - r = 3r

3b - 2b = b

b + 3r

We can see that Ella mistakenly added the r and 4r to become 5r, instead of subtracting the two.

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