Secret number

Find the secret number n, which reversed decreases by 15.4 if the number increases by 15.4.

Final Answer:

n1 =  0.0647
n2 =  -15.4647

Step-by-step explanation:

n+15.41=n115.4  1 n=(n+15.4) 115.4 (n+15.4) n  1 n=(n+15.4) 115.4 (n+15.4) n 15.4n2+237.16n15.4=0  a=15.4;b=237.16;c=15.4 D=b24ac=237.162415.4(15.4)=57193.5056 D>0  n1,2=2ab±D=30.8237.16±57193.51 n1,2=7.7±7.764664 n1=0.064663547=0.0647 n2=15.464663547

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