Final answer:
The value of the given expression G3-h2+8, when g=3 and j=5, is -17.
Step-by-step explanation:
The given equation is G3-h2+8, g=3 and j=5. To solve this equation, we substitute the values of g and j into the equation:
G3-h2+8 = G3-5²+8 = G3-25+8 = G-17.
Therefore, the value of the expression G3-h2+8, when g=3 and j=5, is -17.