Question

-2z² + 4z + 2z² = ?
Can someone please explain how to do this?
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Answer 1

`\\ \sf\longmapsto -2z^2+4z+2z^2`

• Combine like. variables

`\\ \sf\longmapsto -2z^2+2z^2+4z`

`\\ \sf\longmapsto (-2+2)z^2+4z`

`\\ \sf\longmapsto 0z^2+4z`

`\\ \sf\longmapsto 4z`

Answer 2

4z

Explanation:

-2z² + 4z + 2z²

Combine like terms

-2z^2 + 2z^2 +4z

0z^2 +4z

4z