I have just started uni maths and never having done it before I'm having trouble with real simple things (I think)

this is a question from the washington book

one is this:

f(T) = 10.0 + 0.10T + 0.001T^2

t is temperature increases by 10 so f(T + 10)

f(T + 10) = 10 + 0.10(T + 10) + 0.001(T + 10)^2

= 10.0 + 0.10T + 1.0 +0.001T^2 +0.02T + 0.1

I get how the first half works out but the second bit in bold I have no idea how that is possible, as I said its probably very simple but I've been staring at it for ages and can't figure it out...

Would really appreciate any help