Use a all called math w.a.y (remove the periods) trust me it helps with at least 75% of math problems
Answer:
2^1×2^3
2^8×2^−5
2^1×2^2
Step-by-step explanation:
The C(x) equation is a parabola with a squared "x" and a positive leading term coefficient, meaning, is a vertical parabola and it opens upwards
the lowest point, or lowest cost value, it reaches, is the U-turn point, or vertex

so, the lowest cost is at