Solve 2s^3-4r^2 if r=1 and s=5

I did 2*5*5*5=250
4*1*1=4
250-4=246
I also added
2*5^3-4*1^2=246
Am I correct?
Thanks

Please help me.

Yes, you are correct! Your calculations are accurate.

To solve the expression 2s^3 - 4r^2 using the given values r=1 and s=5, you correctly substituted the values into the expression:

2*5^3 - 4*1^2 = 250 - 4 = 246.

This simplifies to:

2*125 - 4*1 = 250 - 4 = 246.

So, the final result is indeed 246.

Well done!