Question

For each expression, write an equivalent expression that uses only addition. Do not include any spaces in your answers. Keep the terms in the same order. 20−9+8−7 and 4x−7y−5z+6

Answer 1

(a)
`20+(-9)+8+(-7)`

(b)
`4x+(-7y)+(-5z)+6`

Explanation:

We are required to write an equivalent expression that uses only addition for each of the given term.

Note that the product of + and - is always -.

Therefore:

(a)20−9+8−7

`20-9+8-7 \\=20+(-9)+8+(-7)`

(b)4x−7y−5z+6

`4x-7y-5z+6\\=4x+(-7y)+(-5z)+6`