Posted by Sandra M on Friday, March 30, 2012 at 8:25pm.
( a - 4 ) ^ 2 = a ^ 2 - 2 * a * 4 + 4 ^ 2 = a ^ 2 - 8 a + 16
2 a ^ 2 -1 6 a + 32 = 2 * [ ( a - 4 ) ]^ 2
( 64 a ^ 2 ) / ( 2 a ^ 2 - 16 a + 32 ) * ( 2 a - 8 ) / 8 a =
( 64 a ^ 2 / 8 a ) * ( 2a - 8 ) / 2 * [ ( a - 4 ) ] ^ 2 =
8 a * ( 2 a - 8 ) / [ 2 * [ ( a - 4 ) ]^ 2 =
[ 8 a * 2 ( a - 4 ) ] / [ 2 * [ ( a - 4 ) ]^ 2 =
[ 8 a * 2 ( a - 4 ) / 2 ] / [ ( a - 4 ) * ( a - 4 ) ] =
8 a / ( a - 4 )
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