Question

10²=u²+2×5×8.4
u²=?
how to do this

Answer 1

100=u²+84
u²=100-84
u²=16
u=√16
u=4
I hope this will help u !!!!!!

Answer 2

10^2=u^2+2×5×8.4
100=u^2+84
u^2=16
u=4