So basically when you are adding or subtracting fractions the denominators the number on the bottom of the fraction 12 in this case and 8 as well the two denominators sharing the least common multiple so what is the lowest multiple of 12 and 8 so count off 12: 12, 24, 36... 8: 8, 16 , 24 does that help?
X(X^2) + X(-3) + 6(X) + 6(-3)
X^3 - 3X +6X - 18
X^3 + 3X - 18
Answer:
2.2 (rounded)
Step-by-step explanation: