Answer:
x³-2x²-4x+8
Step-by-step explanation:
a1=x+2
a2=x²-4⇒q=a2/a1=x-2
⇒a3=q.a2=(x-2).(x²-4)=x³-2x²-4x+8
4 stones is the answer use basic mathematics
4 [ ( x - 5) ( x + 5) ]
4x²-100
4 (x²-25)
4 (x²-5²)
4 [( x - 5) ( x + 5)]