split the middle term

-45x=-18x-27x
 
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Here solution

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X^2-45x+324=0
(x-36)(x-9)=0
X=36 or X=9
S. S={36,9}
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The middle terms are 36 and 9

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Here's the one what you've asked for

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the change in velocity when hydrogen electron jumps from K shell to L-shell is dash
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(x-36)(x-9)
X=36 or X=9

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What are you looking for?