The first and third expressions simplify to 0.
Simplification is to make something easier to do or understand and to make something less complicated.
Given
1. 8g, and -8g
2. -2g, and -2g
3. 5g, and -5g
4. [tex]\rm \dfrac{1}{2}g* \dfrac{1}{2}g, and\ \ - \dfrac{2}{3}g* \dfrac{2}{3} g[/tex]
The expressions simplify to 0.
1. 8g, and -8g on adding it will be
8g-8g = 0
2. -2g, and -2g on adding it will be
-2g-2g = -4g
3. 5g, and -5g on adding it will be
5g-5g = 0
4. [tex]\rm \dfrac{1}{2}g* \dfrac{1}{2}g, and\ \ - \dfrac{2}{3}g* \dfrac{2}{3} g[/tex], on adding it will be
[tex]\rm \dfrac{1}{2}g* \dfrac{1}{2}g, - \dfrac{2}{3}g * \dfrac{2}{3} g \\\\\dfrac{1}{4}g^{2} - \dfrac{4}{9} g^{2} \\\\-\dfrac{7}{36} g^{2}[/tex]
Thus First and third expressions simplify to 0.
More about the simplification link is given below.
https://brainly.com/question/11479469
