the solution of (x+4) ^-(x-5) ^=9is
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a²-b²= ( a+b)(a-b) This identity is used in this sum
a= x+4 , b= x-5
( x+4+x-5) ( x+4-x-5) = 9
( 2x - 1 ) ( -1) =9 ( now multiple the minus 1 )
-2x +1 = 9
-2x= 9-1
-2x = 8
-x = 8 /2
-x = 4
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