document.write( "Question 533544: It is an even two-digit number,the difference of the two digits is 7, and the sum of the digits' squares is 49. What is the even two-digit number? \n" ); document.write( "
Algebra.Com's Answer #352232 by lwsshak3(11628)\"\" \"About 
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It is an even two-digit number,the difference of the two digits is 7, and the sum of the digits' squares is 49. What is the even two-digit number?
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\n" ); document.write( "u=one's digit
\n" ); document.write( "t=ten's digit
\n" ); document.write( "..
\n" ); document.write( "t-u=7
\n" ); document.write( "u=t-7
\n" ); document.write( "t^2+u^2=49
\n" ); document.write( "t^2+(t-7)^2=49
\n" ); document.write( "t^2+t^2-14t+49=49
\n" ); document.write( "2t^2-14t=0
\n" ); document.write( "t^2-7t=0
\n" ); document.write( "t(t-7)=0
\n" ); document.write( "t=0
\n" ); document.write( "u=t-(-7)=0+7=7
\n" ); document.write( "ut=70
\n" ); document.write( "or
\n" ); document.write( "t=7
\n" ); document.write( "u=t-7=0-7=-7
\n" ); document.write( "ut=-70
\n" ); document.write( "ans:
\n" ); document.write( "The even two-digit number=70 \n" ); document.write( "
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