If you increase the temperature of a 5 m long steel bar from −15◦C to 35◦C, how much

Question

longer would it become?

Answer 1

look up the formula and use it

length * temp change * expansion factor

Answer 2

I have used and got the following:
-Thermal expansion of steel= 1.1*10^-5
-the length= 5m which's 0.005k
- the Temp change= -50

my answer was:
-2.75*10^-6 is that correct?

thanks for your help & time☺