This essentially means 12-8
|| means absolute value which is the distance from 0 the number is
Basically it’s the number but positive
So the answer is 4
You put the x=6
6³-4(6)²-12(6)+15=15
The answer is 96. just multiply 6 *2 =12*2=24*2=48*2=96
A is the answer. Hope this helps!