Question

Pentru a=50 calculati a*(a+2)-a*(a-2)

Answer 1

50*(50+2)-50*(50-2)=200
1)50+2=52
2)50-2=48
3)50*52=2600
4)50*48=2400
5)2600-2400=200

Answer 2

$a(a+2)-a(a-2)=? \\ a=50 \\ a(a+2)-a(a-2)=50(50+2)-50(50-2)= \\ =50 \cdot 52-50 \cdot 48=2600-2400=200$