You can put this solution on YOUR website! no its answer is not zero and it is solved inthe follwing ways.
10/(x-7) - 10/(x+7)
on taking the lCM of denominator we get...
[ 10(x+7) - 10(x-7) ] / (x+7)(x-7)
Now in the denomiator we apply the formula .. (a+b)(a-b) = (a)^2 - (b)^2..we get
[ 10(x+7) - 10(x-7) ] / (x)^2 - (7)^2
solving the denomiator would give..
[ 10(x+7) - 10(x-7) ] / x^2 - 49
solving the numerator would give,,,
[ 10x + 70 - 10x + 70 ] / x^2 - 49
140 / x^2 - 49.
