Evaluate
\left(h+10\right)\left(2h+21\right)
Expand
2h^{2}+41h+210
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2\left(100+20h+h^{2}\right)+10+h
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(10+h\right)^{2}.
200+40h+2h^{2}+10+h
Use the distributive property to multiply 2 by 100+20h+h^{2}.
210+40h+2h^{2}+h
Add 200 and 10 to get 210.
210+41h+2h^{2}
Combine 40h and h to get 41h.
2\left(100+20h+h^{2}\right)+10+h
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(10+h\right)^{2}.
200+40h+2h^{2}+10+h
Use the distributive property to multiply 2 by 100+20h+h^{2}.
210+40h+2h^{2}+h
Add 200 and 10 to get 210.
210+41h+2h^{2}
Combine 40h and h to get 41h.
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