ab-bc+ad-dc/ab+bc+ad+dc
Simplify and state the domain
you probably meant ...
(ab-bc+ad-dc)/(ab+bc+ad+dc)
= (b(a-c) - d(a-c))/(b(a+c) + d(a+c))
= (a-c)(b-d)/((a+c)(b+d))
a ≠ -c , b≠ - d
Simplify and state the domain
(ab-bc+ad-dc)/(ab+bc+ad+dc)
= (b(a-c) - d(a-c))/(b(a+c) + d(a+c))
= (a-c)(b-d)/((a+c)(b+d))
a ≠ -c , b≠ - d